Filler - brace adapter for Elegoo Neptune 3 Pro / Plus / Max / Neptune 4

Remix of popular bearing filament mounting system - https://www.printables.com/model/174620-filler-filament-holder Fit is very good, it holds tight. Printed in PETG but PLA would also be fine. 0.20 layer height, 15% infill, standard settings. Supports are recommended (as in the photo) but probably not required. This can work on both sides of the printer, so you have 2 spools to choose from easily, or to have them prepared for a filament swap at a certain layer.