free wheel for Repeat Robotics Axle Ant
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a smooth-running free wheel that mounts to the Repeat Robotics Axle Ant with a 693ZZ ball bearing
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Model information
- Source
- Printables
- Category
- RC & Robotics
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
I've been building a plastic ant with a friend and the “ready to fight” design we downloaded had really mediocre free wheels in the front which print poorly and barely stay on the axles, so I redesigned them to use a 693ZZ ball bearing retained with a screw-on bearing cap. this design should work for the Repeat Robotics Axle Ant or any other axle with a ~5mm OD and M3 inner thread.
print instructions: print the bearing cap on its head, and print the wheel with the narrow side toward the build plate. I printed these in ASA with 40% infill, 5 top and bottom layers; each wheel weighs ~11.7g (with the bearing, without the retaining screw or axle) with these settings, according to PrusaSlicer.
assembly instructions:
- place the wheel loosely over the axle.
- assemble the axle: insert an M3 screw through a 693ZZ ball bearing and screw it into the end of the axle.
- hold the wheel against the side of the bearing, and start the bearing cap into the thread.
- insert a 5.5mm hex key into the hole in the bearing cap and turn it gently to seat the bearing in the wheel and tighten the cap.
- tape up the wheels with electrical tape so they have a little bit better grip than just plastic sliding on the arena floor.