Ever notice that your Elegoo Neptune series 3 or 4 printers have threads for a second spool of filament? I did.

Sure there are other filament spool holder files available for these machines, but I'm obsessive about the small details, so I made this one with the following crucial features:

• Thicker walls than other models for CHONK value
• Chamfered thread ends so it doesn't misthread
• Chamfered base so you don't get a nasty elephant foot that scratches at your wrist when you change spools
• Soft fillets that are pleasing to the eye, touch, and reduce strain concentrations that can lead to failure
• Also see the included STEP file so you can modify the design to hold more spools or whatever

Print this baby with no brim, .25mm layer height, 0.4mm nozzle, 3 wall layers, and 20% infill. PLA works great for this part.