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Strengthened filament guide for IRobertI's UM2 feeder
This is just a modification of one of the parts for this design:
Having had this piece break often (the little "claws" would snap off) I just rotated it to change the direction of the layers, and made a flat bottom. The "back" is also a bit thicker, since I've had it break there as well.
It doesn't look quite as neat with the flat underside, but it holds together better.