Prusa Filament Guide, with diagonal slot
thingiverse
As shown here: http://things.hands.com/thing/PrusaFilamentSpool/ this ensures that the filament on a spool mounted on my variant of the prusia spindle comes off the spindle cleanly. The improvement compared with the version I based it on is that it uses a diagonal slot that does not need the additional flanges, or the suggested bolt to keep hold of the filament.
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