Knuckle couplers for the 1/32 OpenRailway EMD SW1500

cults3d

I've designed knuckle couplers that fit the 1/32 EMD SW1500 (https://cults3d.com/en/3d-model/game/openrailway-emd-sw1500-1-32-locomotive). It wasn't easy as space is scarce but it works. The hook and tang are cut in 2 so they can be printed without support (when printed with support, the result is too rough to ensure smooth operation). Printed in ABS. It's important to select a suitable wall thickness to have the springs fully filled (check in the layers display). If the springs are only partially filled they'll be to weak to keep the coupler straight. With my Prusa I3 MK2 (0.4 mm nozzle) I selected 0.35 mm for the wall thickness and with the Vertex (0.35 mm nozzle) 0.3 mm.. WARNING ! As the SW1500 has a huge overhang, you can't use the coupler on R1 (600mm, 2' radius) tracks. Even on R2 tracks (1200 mm, 3' radius) you'll need to file the opening to widen it a bit or the coupler won't turn enough and the cars will derail.