Core One L (C1L) Top-Feed Spool Holder

I originally made this holder because I needed a short and direct filament path when printing Filament PM TPE 88, an extremely soft TPE filament of 72 Shore A. Feeding flexible filament from the standard spool position can introduce unnecessary resistance and bending, while this holder places the spool directly above the printer for a much cleaner filament path into the extruder.

Features

• Designed for the Prusa CORE One L

• Top-feed filament path – especially useful for TPU, TPE and other very flexible filaments

• Mounts on the rear side of the printer

• Uses 2× M3×6 screws for mounting

• No need to permanently modify the printer

Important – top cover

The top cover must be removed while the spool holder is being used.

However, the holder itself does not need to be removed when you want to put the top cover back on. The holder can stay mounted on the printer and the original top cover can still be installed normally when the top-feed spool holder is not in use.

This makes it easy to leave the holder permanently attached and only remove the top cover when printing from the top-mounted spool.

Hardware required

• 2× M3×6 screws

Originally designed and tested with Filament PM TPE 88, but it should also be useful for other TPU/TPE filaments where minimizing resistance in the filament path is important.

Print settings

I printed mine with:

• 20% infill

• 5 perimeters

These settings provide plenty of stiffness for the holder while keeping the print reasonably lightweight.

CREDITS:
Thanks to @Prusa3D for their open-source approach. Without their Universal Puck model, this simple top-feed spool holder would not have been possible.

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