TOP FILAMENT ROLLER

I use this filament roller over the "Best Filament Shelf Rack" https://www.printables.com/model/243683-best-filament-shelf-rac

I used 8x3mm magnets: 

https://www.amazon.com/DIYMAG-Refrigerator-Magnets-Premium-Brushed/dp/B07B3SDRCP/ref=sr_1_1_sspa?crid=1KD2T3ILFKZJ0&keywords=8x3%2Bmagnets&qid=1658361107&sprefix=8x3%2Bmagnets%2Caps%2C76&sr=8-1-spons&th=1

Also use a filament spool roller bearings: 

https://www.amazon.com/gp/product/B08QVNK6V5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Add a pause on the print at Layer 46. Check the polarity of the magnets and insert them into the part. Resume the print.