Nothing fancy about it, just an option in case you break your bottom plate and don't feel like buying one, but you just happen to own a 3D printer.

Three versions available: No heatserts (no additional hardware required) M2 heatserts (M2 x 4mm OD x 4mm Deep) M2 heatserts (M2 x 3.5mm OD x 3mm Deep)

The heatserts are only used for the skid attachment, all of the frame attachments are still using the self tapping screws that the GAUI uses. For the heatsert versions, two M2x8 screws are required for skid attachment. For the no-heatsert version, two M2x8 self tappers (same that GAUI uses) are required. Machine thread M2x8 will work as well, though hold won't be as strong.