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thanks for taking the time to try out the design.

I can certainly do some additional smoothing on the cap and nut.

The main purpose of the fillet running down the length of the track was to eliminate elephant foot as it caused a real problem considering the tight fit of the channel.

The gears have been revised for v1.1 (used gearotic to generate them) and now mesh much better. Had not considered that elephant foot was a problem for the gears, but can see your point that it can be. i will investigate a solutions.

I am running about 78 grams of weight and it rewinds quickly enough to keep up with the MMU's rapid ejection on filament unload..