Creality CFS Spool Filament Bumper – 3D Printable Upgrade
Improved Filament Guidance for Reliable Retraction
This simple yet effective replacement bumper enhances filament rewind performance on the Creality Filament System (CFS), particularly when using third-party spools with smaller diameters or varying sizes.
Key Benefits:

Guides filament smoothly during retraction back onto the spool, preventing tangles and uneven winding.
Ensures neat spooling all the way to the end of the roll – no more loose or messy filament layers.
Tested successfully with popular brands: Jayo, Sunlu, Geektech, and Eryone (including cardboard spools). Zero retraction errors reported in testing.
Eliminates most CFS retraction issues when combined with the optional "brake mod" (see below).

Easy Installation – No Assembly Required
Simply remove the stock bumper from your CFS spool holder and snap this printed part in its place. It's a direct drop-in replacement!
Additional Tips for Optimal Performance

For complete resolution of retraction problems: Perform the non-reversible "brake mod" by carefully breaking away the thinner filament guide tab in each spool slot using pliers. (Note: This permanent modification will void your CFS warranty.)
After these mods, the only remaining rare issue is filament fully detaching at the very end of an empty spool.
Compatibility with heated CFS mods: Orient the shorter side outward. For heated enclosures, print in heat-resistant material like ABS or ABS-GF.
Prints easily with standard PLA settings.

Latest Update (December 16, 2025):
File revised for improved clearance, resulting in even better print quality and fit.

Perfect drop-in upgrade for Creality K2 Plus, Hi Combo, or any printer with the CFS multi-filament system. Say goodbye to retraction frustrations and enjoy seamless multi-color printing with any filament brand!

Important Disclaimer:
This is an unofficial, community-designed 3D printable modification. Use of this part and any suggested modifications (including the "brake mod") are entirely at your own risk. Breaking or altering original CFS components will void your Creality warranty. The designer and distributor assume no liability for any damage to your printer, CFS unit, or prints resulting from the use of this model. Always exercise caution when modifying hardware.

CFS Top bumper

0.2mm layer, 3 walls, 15% infill