Neptune 2 Filler Spool Holder Adapter
thingiverse
I liked the Filler https://www.thingiverse.com/thing:3020026 spool holder, but the Ender 3 arm for the printer wasn't quite the shape I wanted, so I tried that first then found https://www.thingiverse.com/thing:4894793 that had an insert for the stock Elegoo Neptune 2 arm. For the full spool holder, you will need to go get the roller and the main support from the Filler page. It also has printable bearings that you can use, but I used some skate bearings as recommended instead.
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