Parametric coupling rods for brick-built trains
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Parametric LEGO-compatible coupling rods for trains and other vehicles.
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- Creative Commons — Attribution
These rods were designed to match the coupling rods in the Lego Orient Express set (part #6453350), albeit with a flat back for easy printing.
Modifying the “lengths” array in scad allows you to choose the locations of the pin holes (in stud distance). A lengths array of [0,4,8] will print a coupling rod matching the one found in the Orient Express set.
Other parameters are included if you need to tweak the axle hole sizes or other measurements to better match your printer.
My examples were printed at 0.20mm layer height and 15% infill.
Photos show front and back of the printed coupling rod, a selection of different sized coupling rods compared to part #6453350 (bottom right), Orient Express with one stock coupling rod and one printed coupling rod, and a GWR 5700 MOC using custom length printed rods (0-6-12 lengths).