This is a foot I designed specifically for the Elegoo Neptune 2, 3d Printer. May also work on the Ender 3. I designed it to fit a little loose so I could use double sided tape between the top of the lower part of the foot and the extrusion on the printer. I tried it both ways and the tape wasn't absolutely necessary but I liked using it. I used foam pads on the bottom of the feet to reduce printing noise. This foot gave me enough room below the bottom of the printer to use a side mounted spool holder. Please feel free to leave comments to let me know if you printed it and how it worked for you.
Printed with PLA. Used Cura, No supports, No raft, 20% infill.
Thank you to 3bprints, as I used the spacing for the part from this:
https://www.thingiverse.com/thing:4421026
The author hasn't provided the model origin yet.