bambu spool cardboard core replacement with filament slot

I have been respooling my filament to different spools that better fit into the AMS unit.

I wanted to use the reusable bambu spools and the one printed off of the bambu memory. However, the cardboard core has a RFID tag and the memory card does not have a file for a replacement core.

So I designed this file as a replacement for the cardboard core, but with a slot to hold the end of the filament. This will make it much easier to use the spools for respooling filament.

I was worried that the filament would not release at the end of the roll, but I did some testing at it releases fine. 

UPDATE 4-6-2023 - I saw a comment that the spool core was not holding the filament very well while trying to respool. It is a fine line between too tight and not letting go at the end of a spool and too loose and not holding while winding. So I decided to modify and add a slightly tighter version to hopefully hold better while spooling and still release at the end. Hopefully this will work better.

I have a couple other ideas, so some more versions will be coming soon.