Spool Specs
FILAMENT SPOOL SIZES
Outer diameter, width and hub hole for our 1 kg, 5 kg and 10 kg 3D printer filament spools, plus how our spoolless refills work.
3D PRINTER FILAMENT SPOOL DIMENSIONS
Planning a dry box, a spool holder, a shelf or a printer mount? Here are the measurements for every School House Spools spool. All of our filament is 1.75 mm.
| Spool | Filament | Outer diameter | Width | Hub hole |
|---|---|---|---|---|
| 1 KG STANDARDOpen flanges | 1 kg | 200 mm7.9 in | 60 mm2.4 in | 56 mm2.2 in |
| 1 KG SOLID BLACKClosed walls | 1 kg | 200 mm7.9 in | 60 mm2.4 in | 56 mm2.2 in |
| 1 KG CLEAROpen flanges | 1 kg | 200 mm7.9 in | 60 mm2.4 in | 56 mm2.2 in |
| 5 KGBulk spool | 5 kg | 300 mm11.8 in | 105 mm4.1 in | 55 mm2.2 in |
| 10 KGBulk spool | 10 kg | 350 mm13.8 in | 130 mm5.1 in | 55 mm2.2 in |
Measured across the flanges. Spool dimensions can vary slightly from batch to batch, so leave a little wiggle room in any holder you design.
1 KG FILAMENT SPOOLS: THREE STYLES
Our 1 kg spools all share the same footprint, so they swap into the same holders and dry boxes. What changes is how much of the filament you can see.
STANDARD 1 KG
Open flanges with cutouts, so you can see how much filament is left at a glance.
200 MM × 60 MM · HUB 56 MMSOLID BLACK 1 KG
Closed walls on both sides, so the filament only shows at the outer edge. A clean, uniform look on the shelf.
200 MM × 60 MM · HUB 56 MMCLEAR 1 KG
A clear version of the standard spool. We made it for gradient filaments, so the full color change is visible through the entire spool and not just the outer layer.
200 MM × 60 MM · HUB 56 MMIllustrations are generic renders. Photos of the real spools are coming soon.
5 KG AND 10 KG BULK FILAMENT SPOOLS
Bigger spools mean fewer swaps and better value per kilo. Our 5 kg and 10 kg spools are made for print farms and anyone running long jobs, and they are larger in both diameter and width than a standard 1 kg spool, so check your holder clearance before you order.
5 KG SPOOL
A good step up from 1 kg when you want fewer swaps without a giant footprint.
300 MM × 105 MM · HUB 55 MM10 KG SPOOL
The big one. Ten kilos on a single spool for long runs and unattended printing.
350 MM × 130 MM · HUB 55 MMIllustrations are generic renders. Photos of the real spools are coming soon.
SPOOLLESS REFILLS AND MASTER SPOOLS
Our spoolless refills ship as just the filament, with no plastic spool. Drop a refill into a reusable master spool and keep printing. It saves money and cuts down on empty spools in the trash.
DROP IT IN
Set the refill into your reusable master spool.
LOCK THE NOTCH
The notch on the refill locks it into the master spool, so the refill can't spin inside.
SCREW IT CLOSED
Screw the master spool closed and it's ready to load.
Refills work with Bambu, Inslogic, Sunlu and Anycubic refillable spools, or any generic refillable master spool that matches the same dimensions as our 1 kg spool above.
USING AN AMS LITE?
SOME 1 KG SPOOLS FIT LOOSELY
Some of our 1 kg spools sit a little loose on the AMS Lite, and they could fall off if you use the top mount. Until you've got a tighter fit, keep them off the top mount.
The easy fix is a printable spool adapter that tightens the fit. You can find AMS Lite spool adapters for free on MakerWorld and Printables, and a few minutes of printing solves it.
SPOOL SIZE FAQ
HOW BIG IS A 1 KG SPOOL?
Our 1 kg spools are about 200 mm across, 60 mm wide, with a 56 mm hub hole.
HOW BIG IS A 5 KG SPOOL?
Our 5 kg spool is about 300 mm across and 105 mm wide, with a 55 mm hub hole.
HOW BIG IS A 10 KG SPOOL?
Our 10 kg spool is about 350 mm across and 130 mm wide, with a 55 mm hub hole.
WHY IS THERE A CLEAR SPOOL?
Gradient filaments change color along the length. The clear spool lets you see the whole gradient through the spool.
CAN I REUSE THE SPOOL?
Yes. Pair a master spool with our spoolless refills and keep reusing the same spool.
WHAT FILAMENT DIAMETER DO YOU MAKE?
All of our filament is 1.75 mm.
NEED BULK SPOOLS?
Running a print farm or ordering in volume? Tell us what you need and we'll put together a quote.