I loved the tool-less approach of Dunil's idler so I've updated it for the MMU3!
Most of MMU3 parts should work without any modifications.
--Notable Changes--
-I left out the filament holder and cable loops as they seemed unnecessary.
-Removed the hex wrench holder for the left side to allow to the left idler clip.
-Removed screw covers on the MMU board cover.
The author remixed this model.
Combined parts from Dunil's models to the MMU3 to make an updated version of Dunil's model for the MMU3