W4 · Switch
No power. Each marble flips the tongue.
The marble pushes the tongue to one side as it passes and leaves it there. The next marble takes the other lane and pushes it back.
- Footprint
- 4 steps, 200 mm
- Drop
- 20 mm, 5 %
- Moving parts
- 1 tongue, 1 M3 screw
- PLA, no supports, 3.2 h
- Bought parts
- M3 x 30, washer, lock nut
- In the film
- 0:52
The tongue pivots on one M3 screw and rests against a stop on either side. Every second marble takes the inner loop of Round One, the others the outer one. Verified in the physics simulation over 240 passes; test series 1 checks the tongue on printed parts.
Other switches
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