This model attaches to the right upright of your Bambu A1 with a small square of double stick tape. It prevents the cable and bowden tube from geting behind the upright and snagging. It really only ever occurs if you have to mount your spool holder to the right because of overhead obstructions. You can see picture #2 to see the problem I was dealing with. Because of shelving I had to mount the spool to the right side. Although this is a one in a million problem I didn't find a print out there that solved it. Hopeully if your in the tiny minority with this problem you can find your way to this model. I reckon it's better than the popsicle stick and masking tape I started out using. Created in TinkerCad and finshed (fillet) in Fusion 360.