Flipped NEO AM14U3
grabcad
This is a design I had been working on over the last month or so with Mini-CIMs, but was never happy with the resulting width. The NEO is short enough to allow the drive plates to be .5" closer together (while using chain instead of belts) than the stock AM14U3. Besides the two red plates, this can be manufactured with hand tools. The larger plate carries the motors and bearings, and mounts to existing holes on the AM14U3. Then all that is needed is for clearance holes to be drilled for the bearing flanges, motor shafts, and standoff bolts. The tops of the wheels get quite close to the upper flanges, but those can be easily filed back.
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