This is a Bottom frame handle mount spool holder i designed. It attaches to the handle opening under the printer and needs no hardware to install. The spool holder is threaded and can use either the OG bambu metal spool holder mount or option of using the AMS lite rotary spool holder
The OG mount will require 2 m3x10 screws and 2 m3 nuts
The rotary holder for the ams lite mount can be purchased from Bambu for 11.99, Link below. Make sure to get the green holder.
https://us.store.bambulab.com/products/ams-lite-rotary-spool-holder
I printed this in PLA and came out well strong enough. I didnt print with supports and it came out pretty clean except some deforming at the greatest area of overhang, I added a profile with support in just that area but you should be ok without them as well.
Enjoy!! Please Review!
Updated 3/13/24 - Reduced mount height
I made a quick PTFE guide mount that works with this spool holder. It can be found here. Used a PT4-10 PTFE connector and the original M3x8 screws that came with the bambu spool holder to mount in the rear of printer.
https://makerworld.com/en/models/252859#profileId-269199