Update: Added a 4 slot version of both styles for those that don't need as many slots. 

This is a rack for holding squares. It will hold just about any type of square: combination squares, speed squares, machinist squares, marking squares etc.. Pretty handy rack. There are other models of square racks here on Maker world, but none of them quite had the features or spacing that I wanted for my intended use case. (Bloom Builds - Woodworking Squares Wall Mount, user_2858395082 - Combination Square Holder) 

The rack has nine 5.5 mm wide slots that run front to back, with two additional 65 mm x 6.7 mm slots that run top to bottom along the back of the holder and it has a single 65 mm x 6.7 mm slot that runs right to left along the back of the rack. This allows it to fit a wide variety of squares and measuring tools in a pretty compact space. It will print on any printer except the A1-Mini.

There are two styles, one with a ribbed top (allows items placed crosswise on top to stay in place) and a smooth top surface model. Other than the top surface they are identical. There are cylindrical modifier objects around the screw holes that set that region to 100% concentric infill which creates the strongest possible screw hole. The model prints front bar down on the plate with the back plate and top bars on a 45 degree angle. This keeps the layer lines from running parallel with the stress planes creating a tight, strong print.

Happy Organizing!

See how I am creating order in my shop with these other models. Might find something that is useful to you also!

Toolgrid Organizers

Gridfinity Tool Organization

Toolchest and Drawer Label Systems

DeWalt 20V Outdoor Tool Wall Mount Holders

Hardware and Small Parts Organizers

Miscellaneous Tools and Holders