Sunlu Refill on Bambu Spool Adapter

Sunlu Filament Refill Adapter to use Bambu Spool. I have only tested this on the WHITE Bambu spools though it may work on the others, I don't have any other style Bambu Spools to test fit.  NOTE(s): I discovered one of my Bambu Spools has a very slightly larger bore than the rest so I added a file with Extra Bore Clearance in case you run into the same… v9 is the tighter bore and v11 is the looser bore. Then I found a couple of Sunlu refills I just received are even NARROWER so I updated the thickness accordingly in v12.

The Sunlu Refill sets that include one “Sunlu Master Spool” and several refills wrapped in velcro are a moderately inexpensive way to get decent filament, especially when on sale. The problem is that the Sunlu Master Spool is a sloppy fit and has some feed and retraction issues in the Bambu AMS (possibly even pulling as a single on the external holder) because there is too much slop between both the sides and the spindle. Making a spacer for the side of those Sunlu spools would be very thin because the fit is “almost good” BUT when using these refills on the Bambu spool the center spindle fit is better but the slop to the side plate is MUCH worse. This Adapter Spacer fills that side gap and allows the Sunlu Refill to feed perfectly on the Bambu Spools, far better than it does on the Sunlu “Master Spool”.

This may work with other refills that are normally too narrow for the Bambu spool however I have not tested any other brand refill. If you test it on another brand and it works, please comment with the info. For the original V9, Print time is approximately 90 to 120 minutes and ~49 grams of filament depending on your printer settings, walls, infill, etc. I do 3 walls with 4 top and bottom layers and 15% Gyroid and they are strong and work perfectly. I have printed in PLA Tough and PETG and surprisingly the PLA Tough version survives my filament dryer but your mileage in your dryer may vary.

Print this model with the TEXT UP and the smooth side to the plate, no supports, no brim.