Thank you for this great design! After my tube cap had broken last week I had to find a replacement. The new cap fits perfectly tight into the Extruder base. I did not use the arm, because the stock one seems to do fine and fits well. Great!
I printed 3 lines shell for extra strength as it is said to affect the durability even more than high infill.
I forgot to apply the short ptfe pipe before the nut, first, which led to massive PLA inserting problems… Put it in and now it´s just nice.