Took a 2 hour Laser Cutting and Etching SBU class at Techshop yesterday morning. The class was very interactive and hands-on, covering fire and safety precautions and how to set up and use their laser cutting machine, specifically their Epilog 60 watt, 1 of 3 machines.
I am making a custom case/sleeve out of organic cotton canvas to put a portfolio sample in as self-promotion. Here are several tests on 2 pieces of canvas. The class gives you the basic knowledge, but ultimately each machine and material requires some testing of the correct parameters for the laser, affecting quality and how much material is burned off. I use back and front of the canvas and sometimes have different settings for top and bottom halves. This is not what the final artwork is supposed to look like. But I test different size fonts and line weights and can adjust my artwork from these results. Note the darker brown is due to more heat from the laser and on some areas it was enough heat to burn/cut all the way through the canvas.