Bambu Lab vs. SUNLU vs. eSUN vs. Polymaker vs. Prusament: Reusable Spool Systems Compared
Updated September 26, 2026
Every reusable spool system SpoolNook has researched so far, side by side. Figures come from the same dataset behind the compatibility checker - see each row's brand guide for full sourcing and caveats.
| Brand / model | Reported diameter | Reported hub diameter | Accepts a refill? | Bambu AMS documented fit |
|---|---|---|---|---|
| Bambu Lab Reusable Spool | ~200 mm | ~55 mm | Yes | Fit documented (own spool) |
| SUNLU Gen 3 (2025-) | ~200 mm | ~55 mm | Yes | Fit documented |
| SUNLU Gen 2 | ~195 mm (community-reported, unconfirmed) | Not documented | No | Not verified |
| SUNLU Gen 1 | Not documented | Not documented | No | Not researched |
| eSUN eSPOOL+ | ~200 mm (retailer-reported, "eSpool" name) | ~55 mm (retailer-reported) | Yes | Not verified - conflicting community reports |
| Prusament (cardboard-core, pre-2025) | Not published by Prusa | Not published by Prusa | Yes | Not applicable (Prusa printers, not Bambu AMS) |
| Prusament (OpenPrintTag, 2025-) | "3 mm slimmer" than prior (no absolute figure published) | Not published by Prusa | Yes | Not applicable |
| Polymaker | Polymaker does not sell its own reusable spool - PANCHROMA refills are documented as designed for other brands' spools. See the Polymaker compatibility article. | |||
What this table doesn't tell you
- A close diameter match is a signal, not proof of fit. The locking mechanism (clips, snap rings, notches) has to engage too - see why your filament refill won't fit.
- Fit is directional between brands. A close dimensional match doesn't mean every combination has been documented to work - check the exact pairing in the checker rather than assuming from this table alone.
- Generations matter more than the brand name. SUNLU's own Gen 1 and Gen 2 spools don't accept any refill at all, despite sharing a brand with the refill-compatible Gen 3 - see identifying your spool before assuming your generation matches this table.
Check your exact pairing
This table is a starting point for orientation, not a substitute for the checker's exact-generation matching. Use the compatibility checker with your specific spool, refill, and feeder selected.
