***UPDATE***

This spool weight also fits Inland and Overture Plastic spools!!! If the spool has an inside diameter of 55mm, this spool weight will fit.

I created this low-profile spool weight because I was tired of bulky spool weights sticking out of the side of the spool. This one fits completely inside the center of the spool. It is held in place by flexible ribs that provide enough friction on the inside of the spool to keep it from moving. Just make sure the ribs are on the side of the Bambu spool that has a smaller inside diameter. I included a version that uses batteries for weight and a version that is hollow so you can use whatever you want for weight. I will be making versions of these to fit other size spools as well.