This is a mini spool model that is compatible with the Bambu Lab cardboard filament spool center. This to be used with your Bambu spools with less than ⅓ of filament on them. This has the Bambu notch so be sure to line that up on the spool. This is intended to be used with the AMS lite and A1 or A1 mini printer. Your best print results will be with standard PLA, 0.40 nozzle and use the model file that is setup with adaptive layer thickness. The area where the threads are print better with thinner layers (.08). Overall dimensions are, 140 mm diameter and 65 mm thickness.