Furnished content.
(from Lumberjocks.com)
I was told it was nigh-impossible to do this, so I had to try it. The challenge is getting the getting the angles tight and accurate. It was deceptively challenging.One cannot simply route an L-shape out of plastic because it will leave an inner radius on the inside angle which cannot be fixed with chisels, like you can when working with wood.Creating a crystal clear edge on cut plexiglass without coming out-of-square is quite a challenge and took several jigs. Once I had figured out how to do that, it was a simple matter of using WeldOn/SciGrip #3 solvent to chemically join two edges at a 90-degree angle.The result is great and I can make them faster now, but the first one was definitely a real challenge.I initially did this because I had to determine the feasibility as well as the strength of an edge-joint in acrylic. I am pleased to say that the resulting square is extremely strong (I have dropped it several times—once from a height of 4'—and it has remained intact).