Enjoyed the post. We have made a ton of flashing and testing jigs for my company (flair.co) and I have 3d printed a few but in general, laser cut acrylic seems to be the most popular route unless you need something more than a 2D profile. My favorite strategy is to design them in Fusion360 with the assumption they will be laser cut and then if I don't have access to a laser cutter and/or material, I can still 3D print. Designing for the lost common denominator makes this easy/fast/cheap. Pretty much most anything basic on a laser cutter can be made with a 3D printer if the size isn't too big.