Bambu refill filament adapter for Prusa spools

This adapter allows you to reuse empty Prusa filament spools and convert them to Bambu refill compatible spools. It combines 2 of the existing solutions and makes it stronger, safer from breaking apart (uses twist locking instead of friction holding) and uses less filament than printing a whole new spool (only 70g per spool!). It is also AMS and AMS Lite compatible. PETG or ABS is highly recommended for printing, if you want to dry the filament with the spool later, as PLA won't stand drying over 60 degrees Celsius.

Extra tools required:

• A saw (be sure to wear a mask and ventilate the place, as tiny plastic particles will fly everywhere)
• 8x M3 screws (12-20mm long), preferably woodworking screws.

Assembly steps are shown in the pictures, but essentially you need to saw/cut off the outer ring of the Prusa filament spool centre (the smaller inner circle can stay there, but you can also cut that off if you want). Then print the adapter and align the screw holes so that each of the 4 screws can be inserted. Finally insert the refill filament by aligning its hole with the notch, lock the spool by twisting it and insert the spool lock.