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Alternative UM2 Feeder
Other designs are coming from other people but I figured I'd put this up in case someone likes it. I've used it for 50-100 hours or so and it seems to be holding up so far.
Note that you'll need to customize the firmware to run the feeder in reverse. Alternatively you can mirror the print of the body, that might be easier if you're not comfortable mucking around with custom firmware :)