English:Additive Manufacturing
Additive Manufacturing
Introduction
Additive manufacturing (AM) is a family of manufacturing technologies that create three-dimensional parts from digital model data by successively adding material. In industry and everyday language, the term 3D printing is often used for the same general idea. Unlike subtractive manufacturing, which removes material from a workpiece, AM builds geometry step by step. This makes it especially useful for rapid prototypes, complex geometries, customized products, tooling, jigs, fixtures, replacement parts, and selected end-use components.
As an apprentice, trainee, or vocational student, you need more than the ability to press “print.” A reliable AM workflow combines CAD, process selection, material handling, machine setup, build preparation, safe operation, post-processing, inspection, documentation, and problem solving. The quality of the finished part depends on decisions made throughout this chain.
Learning Goals
By the end of this aiMOOC, you should be able to explain the main principles of additive manufacturing, distinguish the seven process categories used in current ISO/ASTM terminology, prepare a basic digital manufacturing workflow, select suitable materials and processes for a job, identify common production and safety risks, inspect printed parts, document a build, and justify when AM is or is not an appropriate manufacturing method.
You should also be able to communicate with designers, machine operators, quality staff, maintenance personnel, and supervisors using clear technical vocabulary. In vocational practice, this communication is essential because a digital model, a machine parameter, a material batch, or a post-processing step can all affect the final result.
Foundations of Additive Manufacturing
Additive, Subtractive, and Formative Manufacturing
Manufacturing methods can be compared by how they create shape. Additive manufacturing adds material in controlled locations. Subtractive manufacturing removes material by processes such as milling, turning, drilling, grinding, or cutting. Formative manufacturing reshapes material through processes such as forging, rolling, bending, casting, or molding.
AM is not automatically better than conventional manufacturing. A simple part needed in very high quantities may be faster and cheaper to injection mold, stamp, cast, or machine. AM becomes attractive when design complexity, customization, rapid iteration, reduced tooling, short production runs, part consolidation, lightweight structures, or local production create enough value to justify the process.
A skilled technician therefore asks: What must the part do? How many are needed? What material properties are required? What tolerances and surface finish are necessary? What inspection is required? What post-processing is available? How much production time and cost are acceptable?
The Digital-to-Physical Workflow
A typical AM workflow begins with a CAD model or a 3D scan. The geometry is exported in a suitable manufacturing file format and imported into build-preparation or slicing software. The operator chooses orientation, supports, layer settings, machine parameters, and placement on the build platform. The software then creates layer information or machine instructions.
After build preparation, the machine is checked, the correct material is loaded, and the production job is started according to the approved procedure. The part is built layer by layer. After printing, it may need cooling, cleaning, depowdering, washing, support removal, post-curing, heat treatment, machining, or surface finishing. Finally, the part is inspected against the drawing, specification, or work order and the build record is completed.
A useful vocational rule is: the printed object is only one stage of the manufacturing process. A successful job includes the digital file, approved parameters, material identification, machine condition, safe handling, post-processing, inspection, and traceable documentation.
The Seven Process Categories
ISO/ASTM 52900:2021 provides a common vocabulary for additive manufacturing. The seven process categories are shown below. Commercial brand names and machine names may differ, so learning the process principle helps you understand unfamiliar equipment.
| Process category | Basic principle | Typical feedstock | Common vocational focus |
|---|---|---|---|
| Material extrusion | Material is selectively dispensed through a nozzle or orifice. | Thermoplastic filament, pellets, pastes, or other extrudable material | Nozzle temperature, bed adhesion, layer bonding, supports, warping |
| Vat photopolymerization | Liquid photopolymer in a vat is selectively cured by light. | Photopolymer resin | Resin handling, orientation, supports, washing, post-curing |
| Powder bed fusion | Thermal energy selectively fuses regions of a powder bed. | Polymer, metal, or selected ceramic powders | Powder handling, build atmosphere, energy parameters, depowdering |
| Binder jetting | A liquid bonding agent is selectively deposited to join powder material. | Metal, ceramic, or sand powders with binder | Powder spreading, binder control, curing, debinding, sintering |
| Material jetting | Droplets of build material are selectively deposited. | Photopolymers, waxes, or other jettable materials | Jetting quality, support material, curing, surface finish |
| Directed energy deposition | Focused thermal energy melts material as it is deposited. | Metal powder or wire | Deposition path, energy input, shielding, repair and feature addition |
| Sheet lamination | Sheets of material are bonded to build a three-dimensional form. | Paper, polymer, composite, or metal sheet | Bonding, cutting, layer registration, finishing |
Core Processes for Vocational Practice
Material Extrusion
Material extrusion is widely used in schools, workshops, product development, maintenance, and small-batch manufacturing. In fused filament fabrication, a drive system feeds thermoplastic filament into a heated zone. The softened polymer is pushed through a nozzle and deposited along a programmed toolpath. Each deposited road bonds to earlier material and the part grows layer by layer.
Important variables include nozzle temperature, build-platform temperature, layer height, extrusion flow, travel speed, cooling, first-layer condition, part orientation, infill strategy, and support design. These settings interact. For example, a temperature that is too low can reduce interlayer bonding, while excessive heat can worsen dimensional accuracy or surface quality.
Printed polymer parts can show anisotropy, meaning their properties may depend on direction. A component can be stronger along some material paths than across layer interfaces. You should therefore treat orientation as both a geometric and a mechanical decision, not only as a way to make the part fit on the build plate.
Vat Photopolymerization
Vat photopolymerization uses light to selectively solidify liquid photopolymer resin. Stereolithography is a well-known example. These processes can achieve fine features and smooth surfaces, which makes them useful for dental models, patterns, prototypes, visual models, and precision parts made from suitable resins.
A printed resin part normally requires additional handling after the build. Uncured resin must be managed according to the safety data sheet and workplace procedure. Parts may be washed and then post-cured to reach the intended properties. Gloves or other personal protective equipment may be required by the material and process instructions, but PPE is not a substitute for good enclosure, ventilation, safe work practices, and correct chemical handling.
Powder Bed Fusion
Powder bed fusion spreads a thin layer of powder and selectively fuses regions according to the current cross-section of the digital model. A new powder layer is then spread and the cycle repeats. Polymer systems may sinter powder, while many metal systems fully melt selected regions with a laser or electron beam.
Unfused powder can support surrounding geometry in some powder-bed processes, but this does not remove the need for careful orientation, thermal planning, or post-processing. Metal powder systems require strict controls because fine powders may create inhalation, skin, fire, or explosion hazards depending on the material and process.
The build process can be monitored with cameras, thermal sensors, or other instrumentation, especially in advanced metal systems. Monitoring data can help identify unusual behavior and support traceability, but it does not by itself prove that a finished part is defect-free or qualified. Final acceptance can still require dimensional inspection, material testing, non-destructive testing, or other approved methods.
Binder Jetting, Material Jetting, Directed Energy Deposition, and Sheet Lamination
Binder jetting selectively deposits a binder onto a powder bed. Depending on the material system, the “green” part may need curing, depowdering, debinding, infiltration, or sintering before it reaches final properties.
Material jetting deposits tiny droplets of build material. Some systems can combine different materials or colors. Typical technical concerns include jet consistency, curing, support material, dimensional accuracy, and post-processing.
Directed energy deposition feeds metal wire or powder into a focused energy source so that material melts as it is deposited. It is used for feature addition, repair, cladding, and manufacture of larger metal geometries. Process planning must consider heat input, deposition path, shielding, dilution with the substrate, and machining allowances.
Sheet lamination bonds sheets and then cuts or shapes the layers. It can use different sheet materials and bonding mechanisms. You should understand that the category is defined by the layered sheet principle, not by one particular machine design.
Materials and Feedstock
Polymers and Filaments
Common material-extrusion feedstocks include thermoplastics such as PLA, ABS, PETG, polyamides, and engineering polymers. Their behavior differs in melting range, moisture sensitivity, stiffness, toughness, heat resistance, chemical resistance, shrinkage, and printability. A material that prints easily is not automatically suitable for a functional application.
Before production, check the job specification, material identification, supplier data, storage condition, and any drying requirement. Moisture can cause poor extrusion and surface defects in moisture-sensitive polymers. Regrind, recycled content, pigments, fibers, and other additives can also change processing behavior and emissions.
Photopolymer Resins
Photopolymer resins are liquid formulations that solidify when exposed to suitable light. Different grades are developed for rigid, tough, flexible, castable, dental, high-temperature, or other specialized applications. The liquid state is an important safety consideration because skin contact and chemical exposure must be controlled.
Never assume that a cured-looking surface means all material is fully reacted. Follow the manufacturer’s validated wash and post-cure procedure when one is required, and manage contaminated wipes, solvents, gloves, and waste according to workplace and environmental rules.
Powders, Metals, Ceramics, and Composites
Powder-based AM can use polymers, metals, ceramics, sand, and composite feedstocks. Powder flow, particle-size distribution, moisture, oxidation, contamination, and reuse history may affect the process. Metal powder handling can also involve combustible-dust hazards, static electricity, and exposure risks.
Metal AM is widely used where high-value geometry, lightweighting, material performance, repair, or low-volume production justify the process. Examples include aerospace components, medical devices, tooling, heat exchangers, and specialized machine parts.
Design for Additive Manufacturing
Orientation, Supports, and Build Strategy
Part orientation affects support volume, build time, heat flow, surface finish, dimensional accuracy, and sometimes mechanical behavior. A surface facing downward may need support or may show a rougher finish. A tall, thin part may be less stable than a lower orientation. A metal part may need supports not only for geometry but also for heat conduction and restraint.
A good build strategy balances competing goals. Minimizing support material is useful, but not if the new orientation creates unacceptable distortion or critical surfaces. Reducing build height can shorten production time, but not if it weakens an important load path. You should document why an orientation was chosen rather than treating slicer defaults as automatically correct.
Geometry for AM
Design for additive manufacturing can take advantage of complex internal channels, lattice structures, part consolidation, customized shapes, and topology-optimized forms. However, every process has limits. Minimum wall thickness, hole size, unsupported span, feature resolution, trapped powder, drainage, access for support removal, and machining allowances must be considered.
Design freedom is not the same as unlimited manufacturability. A geometry that can be drawn in CAD may still be impossible, unsafe, uneconomical, or difficult to inspect. For vocational work, the best design is one that satisfies function, production, safety, quality, maintenance, and cost requirements together.
Tolerance, Clearance, and Surface Finish
Nominal CAD dimensions are targets, not guarantees. Machine capability, material shrinkage, thermal distortion, layer thickness, calibration, orientation, post-processing, and measurement method all influence final size. Mating parts need deliberate clearance. Holes and shafts may require compensation or finish machining.
Surface roughness can vary with layer height, process, orientation, support contact, powder size, and finishing method. Always identify which surfaces are functionally critical. A cosmetic surface, a sealing face, a bearing seat, and a threaded feature may require very different finishing and inspection plans.
Build Preparation and Machine Setup
Before the Build
Before starting a job, confirm that you have the correct revision of the design and work order. Check that the selected machine, material, and process are approved for the application. Verify machine condition, build-platform condition, material identity, required consumables, extraction or ventilation, guards, interlocks, and any scheduled maintenance or calibration status.
For material extrusion, useful checks can include nozzle condition, bed cleanliness, filament path, correct material profile, first-layer setup, and dry material where required. For resin systems, check vat condition, resin identity, exposure settings, and wash/post-cure capacity. For powder systems, use only approved powder-handling procedures and equipment.
Slicing and Build Preparation
A slicer or build-preparation program converts the digital geometry into layers and manufacturing instructions. Settings can include layer thickness, shell or perimeter strategy, infill, support generation, exposure or energy settings, scan paths, speeds, temperatures, and build placement.
Do not change controlled production parameters simply because a test print “looks better.” In a qualified industrial process, parameter changes may require authorization, testing, and documentation. Apprentices should learn the difference between exploratory prototyping and controlled production.
During the Build
Monitor the job according to the machine and workplace procedure. Do not defeat guards or interlocks to get a better view. Watch for signs such as poor first-layer adhesion, filament under-extrusion, unusual noise, recoater problems, visible distortion, resin separation, powder-spreading defects, temperature alarms, or machine warnings.
If the process moves outside approved limits, follow the stop, isolation, reporting, and escalation procedure for your workplace. A stopped build can be expensive, but continuing an unsafe or invalid build can be more expensive.
Health, Safety, and Responsible Operation
Hazard Identification and Controls
AM hazards vary strongly by process and material. Potential risks include ultrafine particles and volatile organic compounds from some polymer printing, skin or inhalation exposure to powders and liquids, solvent exposure, burns from hot surfaces, entanglement or pinch points from moving parts, laser or ultraviolet radiation, fire, explosion, inert-gas hazards, and ergonomic strain during material handling or post-processing.
Use the hierarchy of controls. Where possible, eliminate or substitute a hazard. Use suitable machine enclosure, local exhaust ventilation, isolation, grounding, bonding, dust control, and other engineering controls where required. Administrative controls include training, restricted access, written procedures, maintenance schedules, housekeeping, spill response, and waste plans. PPE is the final layer of protection and must match the hazard.
Read the Safety Data Sheet for materials you handle. Follow machine manuals, workplace risk assessments, local regulations, and approved standard operating procedures. Only trained and authorized personnel should perform maintenance that exposes lasers, high voltage, heated components, reactive powders, or other guarded hazards.
Safe Material Handling
For filaments, consider emissions, hot-end burns, additives, and any dust created by sanding or finishing. For liquid resins, prevent skin and eye contact and control solvent use. For metal powders, control airborne dust, static discharge, ignition sources, spills, and contamination using the dedicated procedures of the facility.
Good housekeeping is a technical control, not just tidiness. Keep containers labeled, close material containers when not in use, separate clean and contaminated tools, manage waste correctly, and avoid methods that can disperse hazardous dust. Never use compressed air to clean fine hazardous powders unless a specific approved process has been engineered for that purpose.
Post-Processing
Post-processing can determine whether a printed part becomes a usable manufactured component. Possible steps include cooling, part removal, support removal, depowdering, washing, post-curing, debinding, sintering, heat treatment, hot isostatic pressing, shot blasting, tumbling, sanding, coating, machining, polishing, and inspection.
The correct sequence matters. A resin part may need washing before post-curing. A binder-jetted metal part may need debinding and sintering before it reaches useful mechanical properties. A metal powder-bed part may require stress relief before it is cut from the build plate. A critical bore may be printed with machining allowance and finished later.
You should record significant post-processing steps when traceability is required. Changing the heat treatment, cure schedule, support-removal method, or finishing operation can change dimensions, appearance, and mechanical properties.
Quality Assurance and Inspection
What Quality Means in AM
Quality is the degree to which the part and process satisfy defined requirements. A visually attractive print can still fail dimensionally or mechanically. Conversely, a rough-looking prototype may be completely acceptable if appearance is not a requirement.
Typical checks include dimensions, geometry, surface condition, mass, density, fit, mechanical properties, material identity, and internal integrity. Depending on the application, inspection can use calipers, micrometers, gauges, coordinate measuring machines, optical scanning, surface measurement, microscopy, tensile testing, hardness testing, computed tomography, or other non-destructive testing.
Traceability and Process Records
A useful build record may include part number, design revision, machine identification, software version, parameter set, build orientation, material type and batch, operator, date, environmental conditions where relevant, alarms, interruptions, post-processing steps, inspection results, and disposition.
Traceability is especially important when parts are safety-critical, regulated, expensive, or produced repeatedly. Digital files also need version control. Printing the wrong revision perfectly is still a production failure.
Process Capability and Acceptance
Before relying on AM for a repeated production task, the organization needs evidence that the process can meet requirements consistently. Test coupons, benchmark artifacts, machine qualification, material characterization, parameter validation, calibration, preventive maintenance, and statistical process control may all contribute.
Do not confuse monitoring with acceptance. A camera image, melt-pool signal, or machine log can reveal useful process information, but the organization must define what evidence is required before a part is released.
Troubleshooting
Troubleshooting should be systematic. Change one variable at a time when possible, document what you changed, and compare the result with the requirement. Random parameter changes make it difficult to learn from failures.
| Symptom | Possible causes | Useful checks |
|---|---|---|
| Poor first-layer adhesion | Dirty platform, incorrect gap, wrong temperature, unsuitable surface preparation | Platform condition, setup procedure, material profile, first-layer settings |
| Warping or distortion | Thermal gradients, poor orientation, insufficient support, excessive residual stress | Orientation, support strategy, chamber conditions, cooling, material settings |
| Under-extrusion | Partial nozzle blockage, feed problem, wet filament, incorrect flow setting | Nozzle, drive gears, material condition, filament path, approved profile |
| Rough supported surface | Support interface, orientation, energy or exposure settings, removal damage | Support design, contact strategy, orientation, post-processing method |
| Dimensional error | Calibration, shrinkage, incorrect compensation, thermal distortion, measurement method | Machine status, CAD revision, orientation, process history, inspection setup |
| Powder-bed streak or recoating defect | Powder condition, recoater issue, raised feature, contamination | Stop criteria, powder handling record, recoater condition, layer images |
Applications and Workplace Decisions
AM is used for prototypes, tooling, manufacturing aids, jigs, fixtures, customized products, medical devices, aerospace parts, heat exchangers, repair, casting patterns, molds, spare parts, and low-volume production. The strongest business case is often not “printing the same part differently,” but redesigning the product or process to use AM’s specific advantages.
A maintenance team might print a polymer drill guide overnight. A production engineer might combine several components into one printed assembly. A medical manufacturer might make patient-specific geometry. An aerospace supplier might use metal powder bed fusion to produce a lightweight internal channel that would be difficult to machine. Each example requires different evidence, process controls, and economics.
Make-or-Buy and Process Selection
Before choosing AM, compare it with alternative processes. Consider quantity, lead time, tooling, material cost, machine time, labor, failure risk, support material, post-processing, inspection, energy, transport, and the cost of quality. AM can reduce tooling and speed up the first usable part, but conventional methods can dominate at high production volumes.
A professional decision includes the whole process chain. A “four-hour print” may actually require design preparation, machine setup, twelve hours of cooling, support removal, heat treatment, finish machining, inspection, and documentation.
Sustainability and Resource Efficiency
AM can reduce material removal, enable lightweight designs, consolidate parts, and support local or on-demand production. However, it is not automatically the most sustainable option. Energy-intensive machines, failed builds, supports, solvents, uncured resin, powder losses, post-processing, and low machine utilization can all add environmental impact.
Evaluate the complete life cycle. Ask whether the printed design uses less material in service, reduces transport, extends product life, enables repair, improves energy efficiency, or avoids unnecessary inventory. Also ask whether the feedstock can be reused or recycled safely and whether post-processing creates additional waste.
A good sustainability claim is supported by data and a defined comparison, not by the fact that a part was 3D printed.
Vocational Production Scenario
Imagine that a packaging line has an obsolete polymer guide that fails repeatedly. The original supplier no longer stocks the part. Your team has permission to redesign a non-safety-critical replacement.
You measure the worn component, identify its function and interfaces, create a CAD model, choose a suitable polymer, and print a prototype. The first version fits the mounting holes but rubs against the moving product. You revise the clearance and orientation, print again, inspect the critical dimensions, and record the settings. After a supervised functional trial, the improved guide performs correctly.
This scenario shows the value of AM: quick iteration and local production. It also shows why inspection and change control still matter. The first print was not automatically a finished production solution.
Interactive Tasks
Quiz: Test Your Knowledge
What is the defining principle of additive manufacturing? (Material is successively added from digital model data) (!Material is always removed from a solid block) (!Material must always be cast in a mold) (!Material must always be shaped by hand)
Which process category selectively dispenses material through a nozzle or orifice? (Material extrusion) (!Powder bed fusion) (!Sheet lamination) (!Binder jetting)
What happens in vat photopolymerization? (Liquid photopolymer is selectively cured by light) (!Metal sheet is cut and welded into layers) (!A cutting tool removes each layer) (!Powder is always compacted without energy)
What is the basic principle of powder bed fusion? (Thermal energy selectively fuses regions of a powder bed) (!A drill removes powder from a solid block) (!A liquid mold forms every layer) (!Sheets are stapled together)
Why are support structures used in many additive processes? (They stabilize or support geometry during the build) (!They replace all inspection after printing) (!They guarantee isotropic mechanical properties) (!They remove the need for post-processing)
Why is part orientation an important production decision? (It can affect supports surface quality build time and mechanical behavior) (!It only changes the file name) (!It has no effect after slicing) (!It always makes the strongest direction vertical)
What is the best first approach to additive manufacturing safety? (Identify hazards and follow approved controls and procedures) (!Remove guards to observe the process) (!Use PPE instead of ventilation in every case) (!Ignore the material safety data)
What does slicing software mainly do? (It converts digital geometry into layers and manufacturing instructions) (!It chemically cures liquid resin) (!It measures tensile strength) (!It replaces the need for CAD)
Why is dimensional inspection performed? (To compare the manufactured part with specified requirements) (!To make every surface glossy) (!To increase the layer height) (!To change the material batch)
When can additive manufacturing be especially attractive? (For complex customized or low-volume parts) (!Only for identical parts made in millions) (!Whenever no digital model exists) (!Only when post-processing is forbidden)
Memory Game
| CAD | Creation or modification of the digital part geometry |
| Slicing | Division of a digital model into build layers and machine instructions |
| Extrusion | Selective dispensing of material through an opening |
| Curing | Solidification of a reactive material through controlled energy exposure |
| Depowdering | Removal of loose feedstock from a completed powder-based build |
| Traceability | Ability to connect a finished part with its production history |
| Anisotropy | Direction-dependent material or part behavior |
Drag and Drop
| Match the correct terms. | Topic |
|---|---|
| Build orientation | Planned direction and placement of a part in the machine |
| Layer height | Thickness of one deposited or formed layer |
| Infill | Internal material pattern used in many extrusion prints |
| Support structure | Temporary geometry that stabilizes overhangs or critical regions |
| Post-curing | Controlled treatment after printing to complete resin curing |
...
Crossword Puzzle
| Nozzle | Which component dispenses material in many extrusion printers? |
| Resin | Which liquid feedstock is commonly used in vat photopolymerization? |
| Slicer | Which software prepares a model as layers and machine instructions? |
| Sintering | Which thermal process can bond powder particles without fully melting all material? |
| Calibration | What process checks and adjusts measurement or machine performance against a reference? |
| Traceability | What term describes the ability to link a part to its production history? |
LearningApps
Cloze Text
Open-Ended Tasks
Easy
- AM Process Poster: Create a one-page poster that explains additive, subtractive, and formative manufacturing with one workplace example for each.
- Printer Walkaround: Inspect an available training printer without operating it and label the build platform, material supply, motion system, guards, and control interface.
- Slicer Comparison: Import one simple CAD model into a slicer and record how changing layer height affects the estimated number of layers and build time.
- Safety Interview: Interview a workshop instructor or trained operator about three hazards in the local AM area and the controls used for each.
Standard
- Orientation Study: Print or simulate the same simple part in two orientations and compare supports, build time, surface quality, and dimensional results.
- Material Selection Brief: Choose a material for a non-safety-critical workshop fixture and justify your decision using mechanical, thermal, chemical, cost, and processing criteria.
- Defect Investigation: Photograph or document a failed print, identify likely causes, propose controlled checks, and explain how you would test the most likely cause.
- Process Video: Produce a three-minute instructional video that explains one AM process from digital file to inspection and includes the main safety controls.
Advanced
- Design for AM Project: Redesign a small multi-part assembly as an AM-oriented component and justify changes in geometry, orientation, support strategy, inspection access, and post-processing.
- Quality Plan: Develop a quality-control plan for a repeatable printed component that defines critical dimensions, material records, machine records, post-processing, inspection tools, acceptance criteria, and nonconformance handling.
- Workplace AM Study: Visit or virtually investigate a company, training center, makerspace, or laboratory that uses additive manufacturing and analyze its process chain, workforce skills, safety system, and quality controls.
- Manufacturing Decision Report: Compare additive manufacturing with machining, molding, or another conventional process for a real component and recommend the best option using quantity, lead time, tooling, material, quality, post-processing, energy, and cost evidence.
Learning Assessment
- Process Selection Assessment: Given three parts with different materials, quantities, geometries, and tolerances, select a suitable manufacturing route for each and justify why additive manufacturing is or is not appropriate.
- Build Failure Analysis: Analyze a documented failed build and construct a cause-and-effect explanation that connects symptoms with material condition, machine setup, parameters, orientation, and environment.
- Safety Transfer Task: Compare the hazards of a filament printer, a resin printer, and a metal powder system and propose controls using the hierarchy of controls.
- Quality Evidence Task: Design an inspection strategy for a functional AM part and explain which requirements can be verified visually, dimensionally, mechanically, or by advanced testing.
- Digital Thread Assessment: Trace one hypothetical component from CAD revision through slicing, machine setup, material batch, printing, post-processing, inspection, and final release, identifying where version or documentation errors could occur.
- Business Case Assessment: Evaluate whether a low-volume spare part should be stocked, machined, molded, or additively manufactured and defend your recommendation with technical and economic reasoning.
Evidence of Learning
Important evidence includes accurate use of AM vocabulary, correct explanation of the seven process categories, safe identification of process-specific hazards, competent use of CAD and build-preparation concepts, justified material and process choices, reliable machine-setup checks, systematic troubleshooting, suitable post-processing decisions, dimensional and quality inspection, and traceable documentation.
A strong learner portfolio can contain CAD models, slicer screenshots, parameter comparison sheets, risk assessments, inspection records, defect analyses, process videos, technical posters, photographs of test parts, interview notes, and a manufacturing decision report. Evidence should show not only that you can make a part, but that you can explain why the process was chosen, how risks were controlled, how quality was checked, and how results could be transferred to a new workplace task.
OERs on the Topic
For current technical reference, use NIST Additive Manufacturing, NIOSH 3D Printing and Additive Manufacturing, and ISO/ASTM 52900:2021.
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