I wanted a way of using my Creality filament estimator that my daughter got me for Christmas. I like its smooth bearings. So, after scouring the interwebs and not finding a working adapter that didn't let the spool droop. I went back and looked at these two files. and drew my inspiration from them. Spool adapter v2 - tom.foz.121 | Nexprint: Free 3D Model Downloads and https://www.nexprint.com/en/models/G1809974 which put together is what I wanted. so basically its these two files combined. but with a bit extra girth for stability. the Creality part of it is a tiny bit longer, so it is a sturdy fit, a bit of a push is needed. a added plus is the inner most side of the “Creality estimator” is thicker and keeps your spool from touching the machine so it doesn't rub the cc while it is rotating. putting it on is simple. Just remove the four screws and swap out the spool holders and replace the spool tubes as you would when you originally put it on. I did mine it Black elegoo rapid PET-G.