Simple way to locate and attach parts using a laser

I did not invent this technique, but use it often when building structures that have been cut out on a 2D laser. The example is in .25" steel, but will work in MDF and other materials.
Basically, you use tabs and slots to locate the parts in 90 degree plains. A hole in one part and a cutout that holds a hex nut in the other provide the gripping power. This method is astonishing easy and reliable. Try it if you need a joint.


Dont forget to round out (“dogbone”) your corners so you dont get stress fractures, especially if using acrylic:

stole these from this article:

How to make interlocking acrylic designs


I would use stainless fender washers on the acrylic/nut interface.