The Multiboard Mounted 2x2 Gridfinity Baseplate is suitable for holding The Gridfinity Post-It Note Holder or any other 2x2 mounted accessory.

Print upright with no supports at 0.2mm layer height with three walls for optimal strength.
Requires 2 "9 mm Small Thread, Plain Head, T-Bolt" to mount to your Multiboard, which may be obtained from "Keep Making" on Thangs.