Robo3D R1 Filament guide
thingiverse
Install a guide at the top of the printer's cut-out hole according to this procedure: Twist it to lock it firmly in place. Cut 6-8 inches of 4mm PTFE tubing and insert it through the hole so that filament is fed from below, exiting at the top. Next, pull the filament into the extruder. This will cause the PTFE tube to bow outwards, preventing filament from snagging or grinding against the printer during high-object printing or left-to-right motion. Attach the spool on the side of the printer.
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