This is a spool weight that I designed to fit the Sunlu ,Anycubic and the new JAYO plastic filament spools, which are very light and tend to cause problems in the AMS once they get empty.

The spool weight can hold up to 15 AA batteries inside, which adds up to 440g of total weight. This helps the filament to feed more smoothly and consistently. The spool weight has an outer core diameter of 71mm, which matches the inner diameter of the Sunlu (72mm) and Anycubic (74mm) spools. 

It can be printed without support and I picked tolerances that make it easy enough to open. Some others I've tried were too tight for my taste.

Boosts are greatly appreciated. They not only help offset the filament costs of test printing such designs and going through multiple iterations until they're 'ready' to share, but they're also a vote of confidence that inspires us to keep exploring new ideas and pushing the limits of what's possible with 3D printing. I'm deeply thankful for every single boost and the support it represents. Whether you use them on my models or others' - please utilize them.