Guides

Identification, measurement, and generation guides that back the compatibility checker. Each one links to its sources.

• Filament Refill vs. Spool: What's the Difference?

  What a filament refill is, what a reusable spool is, and why the two are sold separately.

  Updated September 22, 2026

• How to Identify Your Reusable Filament Spool

  Identify your reusable spool's brand, model, and generation before you buy a refill, using documented visual and measurement clues.

  Updated September 22, 2026

• SUNLU Gen 2 vs. Gen 3 Spool: How to Tell Them Apart

  Documented differences between the SUNLU Gen 2 and Gen 3 reusable spools, including refill and Bambu Lab AMS compatibility.

  Updated September 22, 2026

• Prusament Refill Compatibility Across Spool Generations

  Which Prusament refills fit which Prusament spool generation, based on Prusa's own documentation.

  Updated September 22, 2026

• How to Measure a Filament Refill's Inner Diameter

  A step-by-step method for measuring a refill's core diameter and width with calipers, so you can check fit yourself.

  Updated September 22, 2026

• AMS and Feeder Spool Dimensions by Brand

  Documented spool width and diameter tolerances for AMS-style feeders, by exact brand and model, with gaps flagged where evidence is missing.

  Updated September 22, 2026

• RFID and NFC Filament Tags Explained

  What RFID and NFC spool tags actually do (and don't do) for automatic material recognition on systems like Bambu Lab AMS and Prusa OpenPrintTag.

  Updated September 25, 2026

• Why Your Filament Refill Won't Fit: 5 Common Causes

  The five most common reasons a filament refill won't mount on a reusable spool, and how to tell which one you're dealing with.

  Updated September 25, 2026

• How to Store Filament Refills: Humidity, Drying, and Shelf Life

  Why refills need more careful humidity control than factory-sealed spools, by material, with a practical storage and drying routine.

  Updated September 25, 2026

• Do You Need an AMS or Multi-Material System to Use Filament Refills?

  Reusable spools and refills work with or without an automated feeder like Bambu Lab's AMS - what changes, and what the feeder actually adds.

  Updated September 25, 2026

• Filament Spool Adapter Guide: When You Need One and How They Work

  What a 3D-printed spool adapter actually fixes, when a refill or feeder mismatch calls for one, and what to check before you print one.

  Updated September 25, 2026

• Filament Spool Terminology Glossary

  Master spool, spool-free, reusable spool, AMS, MMU - plain definitions for the inconsistent terms used across brands and communities.

  Updated September 26, 2026

• How to Track Remaining Filament on a Refill Without RFID

  Practical ways to estimate how much filament is left on an untagged refill, since weight and length aren't automatically tracked without a recognized RFID/NFC tag.

  Updated September 26, 2026

• Do You Need a Dry Box for Filament Refills?

  When a dedicated dry box is worth it for refills versus a sealed container with desiccant, by material and how often you print.

  Updated September 26, 2026

• Bambu Lab vs. SUNLU vs. eSUN vs. Polymaker vs. Prusament: Reusable Spool Systems Compared

  Every documented reusable spool system side by side - dimensions, refill support, feeder compatibility, and where the evidence is thin.

  Updated September 26, 2026

• Filament Refill & Reusable Spool FAQ

  Quick, direct answers to the most common filament refill and reusable spool compatibility questions, each linking to the full documented answer.

  Updated September 26, 2026

• 1.75mm vs. 2.85mm Filament: Does Diameter Affect Spool Compatibility?

  Filament diameter and spool/core size are two separate specifications that are easy to confuse - what each one actually controls.

  Updated September 26, 2026