Update April 14, 2026: Added a newest tight v3 which has a tight grip on spool edges AND an ergonomically designed easy-insertion entry for the filament with a positive snap. This tight v3 should replace the prior 2 versions because it has all the newest, best features incorporated. DOWNLOAD V3 if you are new to this thread.

Update April 6, 2026: I added a slightly tighter version where the clip opening at the smallest point is only 0.8mm. This should accommodate even the thinnest filament spools you encounter. Enjoy!

I tried nearly every filament clip available across Printables, Thingiverse, and MakerWorld. Each one fell short in at least one critical way: too loose on the spool, too stiff to install, too aggressive on filament, incompatible with different spool designs, or simply awkward to use.

So I designed this one from scratch.

This clip is engineered to be a true universal filament clip, working reliably across 200 g to 3 kg spools, plastic and cardboard, and a wide range of filament brands and spool geometries.

WHY THIS CLIP WORKS BETTER

1. Easy spool attachment and removal
   A wide, smooth V-shaped entry allows the clip to slide onto spool edges easily, even on thick rims. No forcing or fighting required.

2. Wide spool compatibility
   Securely grips spool edges from approximately 1.5 mm to 5.5 mm thick, covering the vast majority of consumer filament spools.

3. Designed for real spool geometry
   The clip length is tuned to reach past the thicker outer rim (typically the first 5–7 mm) and clamp onto the thinner structural section of the spool, where most clips fail to hold.

4. Balanced flex with reliable grip
   Provides light grip on thin spool frames and stronger grip on thicker edges. The clip stays on securely and will not fall off unless intentionally removed.

5. Filament-safe holding force
   The filament channel securely holds 1.75 mm filament with just enough resistance to prevent movement, without denting, kinking, or stressing the filament.

6. Smooth, damage-free contact surfaces
   Rounded, teardrop-inspired geometry with flared ends prevents scratching or crushing and works well with cardboard spools.

7. Simple, satisfying operation
   Filament insertion and removal is smooth and tool-free, with a subtle, silent snap you can feel.

8. Strong and easy to print
   Prints cleanly without supports and maintains strength across common layer heights.

9. Material-agnostic, PETG recommended
   Works well in PLA, PLA+, PETG, and TPU. Printed in PETG, it is extremely durable and should last a lifetime of spool changes.

This clip was tested across spools from multiple manufacturers including Bambu, Creality, Kingroon, Elegoo, Sunlu, Nova, Anycubic, Siraya Tech, and Giantarm. It is designed to just work, no matter what spool you have.

RECOMMENDED PRINT SETTINGS

Nozzle: 0.4 mm
Layer height: 0.2 to 0.28 mm
Walls: 3 or more perimeters
Infill: 20 to 30 percent
Supports: none
Material: PETG recommended (PLA or PLA+ also works)

Print profile (.3mf file) for Bambu P1S printer and Kingroon PETG filament included.

If you find this useful, a like or download helps others find it.
Feel free to share on other platforms, but please credit me as the original designer.
Feedback and remixes are always welcome.