Alfawise U20 Add-ons

Needed a few parts for the new Alfawise U20. The printer is far from a "CR-10 killer", but with some work, is a good competitor.

The spring washer are pretty self explanatory.

I created the bed jack as a tool to slowly flatten my bed out a little bit. When my Alfawise arrived, the bed was screwed down so tight that not only the bed support was bowed, but the bed had about a 1.5-2 mm dip in the middle. I simply placed it under the bed and re-tightened until the bed bowed the opposite direct