The Creality multi KG spool holder is actually too smooth. This is a "brake" to give the Creality spool holder some friction so it doesn't unspool. Designed for 5KG rolls.
Use neoprene foam for the contact material such as weather stripping that you can buy for cheap at the hardware store,
Print with enforcer supports and 0.2 mm layer height. I use PLA and it works great.
The tolerances of the threads are pretty tight. I recommend you apply some Vaseline to the threads before screwing in the nut.
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