Airless Tire 100mm for BFBuggy
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100mm outer diameter Airless Tire for RC BFBuggy with wheel for 5mm shaft
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My first attempt at an airless tire design for a Radio Controlled car. These have an outer diameter of 100mm or approximately 4 inches. They looked a bit oversize on the BFBuggy which is 13" or 32cm long, which is the look I wanted. I don't have other RC cars so I'm guessing that's equivalent to a 1/8 scale Buggy or Truggy - leave a comment if you know different.
I used three M3 x 6 Philips Pan head screws with M3 nuts to hold the two halves of the wheel together. The center hole is designed for a M5 screw with an M5 nylon lock nut which is what is used on the BFBuggy.
The holes for the nuts are a bit tight since I wanted them to be press fit, you might have to adjust depending on the accuracy of your printer.
Note: the wheel is not symmetrical since there are 3 spokes on a 16 bump pattern, so I added a notch in one of the 3mm bolt holes to help with alignment during assembly.
The tire was printed in 95A TPU on an Ultimaker 3. You'll have to tweak your own print settings, I wasn't happy with the amount of stringing on the Ultimaker and I couldn't get the Ultimaker to reliably print single walled parts in TPU. I strongly recommend a raft with narrow gap if you're printing on glass.
It ended up a lot stiffer than I'd hoped. It was designed for two walls using a 0.4mm nozzle, I plan to redesign for a single 0.4mm wall after I've upgraded my Ender 3 to be able to print flexible filaments.
The wheel was printed in a red/gold silk filament on my Ender 3.
Reference BFBuggy on Thingiverse:
https://www.thingiverse.com/thing:573333
I don't recommend the BFBuggy, there are a number of issues with its design, but I'd love to know if you can use these wheels on other RC buggies of similar size. The spacer is included to clear the BFBuggy steering knuckle if you decide to make one.