A fast-to-print reusable spool adapter ring for using cardboard spools in the Bambu Labs AMS, with profiles for 0.4mm, 0.6mm and 0.8mm nozzles.

Features:

• Prints reliably without supports.
• Attaches securely without glue.
• Prints in under 9 minutes with a 0.4mm nozzle (7 minutes with a 0.8mm nozzle).
• Uses less than 6g of filament with a 0.4mm nozzle (7.6g of filament with a 0.8mm nozzle).
• Works reliably in the AMS.
• Installs easily (can be done one-handed: push-click on).
• Works with spools with damaged edges (cardboard delaminating, frayed, dented etc).
• Can be removed and reused easily.
• Can be easily XY scaled to fit other size cardboard spools.
• Doesn't obscure any of the holes around the edges of spools for securing filament.

Tested with cardboard spools from:

• Comgrow
• Creality
• Duramic
• Elegoo
• eSun
• Eryone (the Eryone profile is XY scaled by 98.5% to fit their spools)
• Overture
• Polymaker (PolyMax, PolyTerra, PolyLite etc)
• Redline
• Siddament (the Siddament profile is scaled 99% to fit their spools after being dried - I found that they shrunk a little).
• Sovol

It should also be fine with cardboard spools from other filament vendors including:

• 3DQF
• Anycubic
• Canadian Filaments
• Filamentive
• Filaments.ca
• Inland
• Jayo
• Matter3D
• X3D
• Ziro

Please let me know if it works with spools from other vendors, or needs to be scaled for spools from other vendors.

I suggest printing in PETG for spools of low temperature filaments (PLA etc) and ASA or ABS for higher temperature filaments, so that you can leave the spool rings on when you dry a spool. PLA works fine, but may shrink and distort when in a filament dryer over time.

After attaching each ring, check that the inside edge of the spool is sitting inside the ring. If it won't pop into place (normally because the edge of the cardboard is damaged) then run the wide part of a flat blade screwdriver around the edge of the inside of the spool to push the cardboard into place.