FreeLast centimeters or Print it all !
Printables
11 model
Free
FreeBanana for Scale
Printables
Freecentimeter cube
Printables
Freecalibration centimeter grid
Thingiverse
Free20x50x10 mm - 10 cubic centimetres volume calculation part
Thingiverse
FreeOne Cubic centimeter cube (calibration)
Thingiverse
FreePhoto scale Parametric inch and centimeter
Printables
FreePhoto reference scale (cm) - single colour, scanner ready
Printables
FreePhoto Measurement Bars for MINI 1 Color Change or AMS
Printables
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FreeMetric Screw Gauge Card – M3 to M10
Cults3D
FreeCentimetre and Inch Ruler (20cm/~8in)
Thingiverse