Machinist square 3D print model

With this square you can mount objects on it because of the grooves. You can see measurements on one of the photos. If you want it for heavy duty work I would suggest you to make it with an appropriate resin casting or use the step file to machine one with a cnc for metal. For metrology purpose you can totally print it with a resin printer to get the maximum precision and use it as is.

Let me know if you have any questions.