It is a technique we call Interlocking T-Bolt Construction. It consists of a T-cutout in one piece of acrylic (or any 3 mm stock) and a receptacle in another piece. These pieces can then be bolted together making a very secure 90 degree joint. A deceptively simple technique that has unlimited possibilities.
All that is required is an idea, some drawing software, and access to a laser cutter.
Lets get started.
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a note on metric units
it should be noted that throughout we refer to 3mm thick acrylic. This is often sold as 1/8" acrylic and is not a big issue as the difference is less than 0.007".
Step 1: Software
To Get Inkscape: