Filament spool-holder; 75mm roll; AmazonBasics
thingiverse
This is a spool-holder with two bearings. Byside a 3d-printer you need two bearings for some bucks (https://www.amazon.de/sourcing-map-Kugellager-Geschirmt-Kohlenstoffstahl/dp/B082WRGW5Z/ref=sr_1_3?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=22WHP2TZ39LEQ&dchild=1&keywords=kugellager+52mm+au%C3%9Fendurchmesser&qid=1611151674&sprefix=kugellager+52mm%2Caps%2C190&sr=8-3) You can use the screws from the original spool holder of the Ender3 to connect the spool-holder to the printer.
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