Simple remix of Zachary's design that adds a key hole for hanging it with other tools (which is my prefer method).  The hole is 7 mm and fits most pegboard hooks.  Works with both small and medium sized t bolts for multiboard.  Helps greatly in getting extra torque for tight spots when attaching objects to a multiboard.  

I printed it on a Bambu X1C with no supports and just a brim, but would assume it would work just as well on other printers.