The right z-axis top piece with a mount for a reverse bowden. Moving the filament spool off the z plate did wonders for my prints. Using the Prusa Mini spool holder for flawless unwinding. Uses 6mm bowden coupler and 60mm of bowden tube. Need to tap the hole with a 6mm x 1.0 tap.
Print in PETG .2mm height, 4 perimeters, 5 top and bottom layers. No supports.
The author hasn't provided the model origin yet.