Ever tried printing from a leftover coil of filament just lying loose? It starts fine... until it suddenly tangles, jerks the extruder, and your print fails halfway through. Annoying, right? And when you toss two or three leftovers into the same box, they somehow tie themselves into a knot like it’s their hobby.

Sure, you could wind your leftovers onto a full-size spool – but unless you’ve got infinite shelf space, that’s a waste. Full-size reels eat up way too much room when you’re just trying to save a few dozen grams of filament. These mini spools are a smarter fix.

And as a bonus? Each one only takes about 40–60 grams to print – so you can make them from leftovers, for leftovers. Circle of filament life. 😎

Features

• Stops filament from tangling mid-print

• Prevents leftover coils from tangling together in storage

• Fits standard filament dryers (52mm hub)

• Two inner diameters:

– 58 mm for softer materials (TPU etc.)

– 100 mm for stiffer materials (PLA, PETG…)

• Two widths: 30 mm and 60 mm

• 12 locking holes per spool for securing filament ends

• Includes material tags (PLA, PETG, TPU) and flat clips for tidy filament retention

• Saves space compared to storing leftovers on full-size spools

Print Settings

• Material: PETG (recommended for durability and slight flex)

• Nozzle: 0.4 mm

• Layer height: 0.2 mm

• Perimeters: 2

• Infill: 15% honeycomb

• Supports: Not needed

• Recommended: Slice in two halves with dovetail lock and glue for best surface finish

• Estimated material use: 40–60 g per spool

Leftover Mini Spools

0.2mm layer, 2 walls, 15% infill