This is a light skeleton version that still has magnets of Zack Freedman's Gridfinity system: https://gridfinity.xyz/

It matches the Gridfinity spec, and should be compatible with any Gridfinity boxes and addons.

Changes from original:
- Skeleton version with minimal height to save filament and height

- No screw holes or anyway to attach them together without super glue.

- Magnet holes are 6.1mm x 2.1mm for a tight press fit, no super glue needed.

- corners are not rounded to attach together and fit in corners nicer.

- There's a hole on the bottom of the magnet so you can push the magnets back out if needed.

It contains every model size from 1x1 to 6x6