I redesigned a reinforced extruder tension arm for my Neptune 4 Plus / MAX as mine broke.

It can be printed with any material, I used PET and put 50% infill, if you use PLA put 100% infill.

It may also work with Neptune 4Pro/4/3 but I don't have these machines to verify.

If this helped you please leave a like.

This design is meant to help if anyone else had the same issues as me. It's been running 24/7 with no issues or wear and tear and as seen in the photos I print with recycled PET from bottles. I have one installed on my extruder and a spare one printed in case I have issues for a quick change.