For 3D-Fuel materials, we primarily use two spools in the US: 1kg and 4kg. The material for these spools is High Impact Polystyrene
NOTE: We've used an AMS compatible spool design for our 1kg spools since October 2023. As of April 2025, effectively all of our inventory is on AMS-compatible spools unless otherwise mentioned.
Our "old" 1kg spools fit in the Bambu Lab AMS but did not allow the lid to fully close (it wasn't be able to latch shut).
The new 1kg spool enables you to close and latch the Bambu Lab AMS fully. It is also compatible with all 4 positions on the AMS Lite.
| Measurement | New 1kg Spool (AMS compatible) | Old 1kg Spool | 4kg Spool |
25lb/11kg Spool |
| d1) Flange Diameter | 200mm / 7.87" | 202mm / 7.93" | 298.5mm / 11.75" | 406mm / 16" |
| L1) Outside Width | 68mm / 2.68" | 69mm / 2.72" | 101.6mm / 4.0" | 210mm / 8.25" |
| L2) Traverse or Inside Width | 59mm / 2.32" | 60mm / 2.36" | 91.4mm / 3.6" |
178mm / 7" |
| d2) Barrel (Core) Outer Diameter | 105mm / 4.13" | 95mm / 3.75" | 128.2mm / 5.046" | 213mm / 8.375" |
| d3) Arbor Hole or Center Inside Diameter | 52mm / 2.05" | 54mm / 2.12" | 52.4mm / 2.063" | 30.5mm / 1.2" |
| Spool Weight (empty) | 225g / 7.9 oz | 266g / 9.3 oz | 920g / 2.0 lbs. | n/a |
| Spool Material | Recycled HIPS | HIPS | HIPS |
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