I see some problems with this design
- There does not seem to be any tension adjustment or manual filament release.
- The same side of the filament is gripped by both of the hobbed gears. This may unduly bend and deform that side, and prints with heavy retraction may fail.
- There are no filament guides. This design won't work well with flexible filaments.
So you could use this and then just have to add a second tip/Bowden tube to have a dual extrusion um2+?
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