HO Scale Ruler
cults3d
HO scale ruler, each tick is exactly 3.5mm per NMRA standards (NMRA) standard "S-1.2 General Standard Scales" defines HO scale as 3.5 mm (0.1378 in) representing 1 real foot (304.8 mm) – a ratio of 1:87.0857142, usually rounded to 1:87.1.[6] The precise definition of HO scale varies slightly by country and manufacturer. The overall length is established by the width of my printer.
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