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UM2 Lower Filament Guide
There are loads of variations of these.
This one positions the filament under the feeder without needing to unbolt any components and without drilling any holes in the case.
It clips under the lower lip of the printer housing so there is no damage to the printer at all. The support is cranked round and above the power connector.
The bearings and pulley keep the friction on the filament very low.
I printed mine in PETG but I suspect that PLA would work just as well.