Norstar M140-M Mig Welder Roller Arm

The roller arm plastic housing that holds the roller bearing is not a replacement part you can purchase as far as I'm aware. This would require you to purchase a secondhand welder just for this small part or purchase a whole new welder.

The OEM plastic is weak and brittle. My welder was stored for about 3 years and after only less than 5 uses, the roller arm broke. I tried an epoxy repair but it did not work out. The wire would not feed properly and constantly jam. 

The design is not a carbon copy of the original, it's a more simplified design but it's close to the original and functions the same. It can withstand higher spring pressures unlike the original part that uses weak and brittle plastic.

My options were to purchase a second hand non-functioning welder for $300(I originally purchased the welder for nearly $500), or purchase a new, different brand welder for $800 or redesign the part for a lot less.

The part should be printed upside down in accordance to it's orientation while installed in the welder while the welder is positioned upright. I used supports on the build plate only for the outer slots where the roller bearings sits in. Material is PLA. Infill is default 15% along with other settings also being default.