I use the trotec website
https://www.troteclaser.com/en-gb/knowledge/do-it-yourself-samples/
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Thank you! I googled all sorts of stuff like “Trotec materials guide” and “Speedy 300 recommended power settings” and never once came across this. I found a few pages selling the laser cutter itself, but otherwise nothing.
My google-fu is weak. I will return to the peak of Mt. Ser Chen-Jin to complete my training.