\version "2.18.2"

% Custom size to fit output.
#(set! paper-alist (cons '("my size" . (cons (* 27 mm) (* 18 mm))) paper-alist))
\paper {
  #(set-paper-size "my size")
}

\header {
  % Remove footer text.
  tagline = ""
}

{
  % Remove bar line at the end of the line.
  \override Score.BarLine.break-visibility = ##(#f #t #t)
  
  % Hide the time signature.
  \once \override Staff.TimeSignature #'stencil = ##f
  
  <c' e' g'>1
}