Wow! That turned out really nice 
you found a good slipring yet?
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This is where I’m at the moment. The first design (printed in white) was to squarish (ugly AF 
) and I started over with a more rounded/ organic design. I’m still strugling with the sizing of the whole thing. When it’s tested and I’m satisfied…will share it for others to use 
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Here’s my old top enclosure made for two big Lipos, round edges and small compartments for on/off button and charger port.
Step files here: https://grabcad.com/library/old-top-lipo-enclosure-1
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Time to make the caster out of a 20 x 40 mm squared pipe. First step, glue a cutting/drilling template on the pipe.
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Unfortunately there is to much flex. Feels soft and spongy.
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That’s too bad… maybe design a solid casting for the mono swingarm?
How is the bearing block holding up?
Fill the tubing with JB weld
JK this is a motocross racing trick to prevent dents.
would trying my e-z removal side plate idea make sense with this prototype?
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The mono swingarm (the current one) might work for a hubmotor setup where the wheel axle is shorter. So for a belt/chain drive system I have to design a two arm caster. How’s your design coming along? Did you find that 50t D-shaft wheel pulley?
The block is really solid, no need to change anything there.