ApolloRivalBarrel (multi part)
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/lRzU4JuxgCc
Broke the barrel into 2 parts for my smaller printer and created slotted rails for reconnecting the parts after into a very solid unit. Also lengthened the barrel about 2cm so the pump grip does not go past the front of the barrel.