This is a plug that allows you to use one of the hexes of the paint rack remixed by janreich (https://www.thingiverse.com/thing:5020120) as a paint brush container. The plug goes in the bottom end of the hex and closes the hole that is currently at the base of the paint rack. The plug will add 2 mm in height to the rack so I printed two out and attached it to janreich's L_end.stl file. The connection is held through friction and no glue is needed.

Prusa

I3 MK3S

No

No

I added a brim to help with bed adhesion.