Quadrilla double spacer with drop
thingiverse
Designed to work with the Hape Quadrilla marble run. I love playing with this thing, using the chidren as an excuse. This part is the size of two of the purple quadrilla spacers, but it also has a hole in the side to allow marbles to drop. I find this really useful for two reasons: firstly, I never have enough purple spaces, and secondly because it means you can squeeze in extra junctions without increasing the height of the run. Print with 3 shells, 20% infill, and supports on. The original CAD is here: https://cad.onshape.com/documents/89ac9f1fb64f232a15002c44/w/2d69547cfbc3c1bd9276d64a/e/b12799704fbc0c133e811e38
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