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Hi, nice instructable! I have a tip to drill plexi. I alwas use a multi-step-drill. I don't know what it's called in the US. It has several steps from 6 to 20 or 30 mm(i'm from the Netherlands so i use the metric system) in steps of 2 mm. Instead of a spiral to cut it has straigt cut grooves. It won't lift your plexi or pull the drilbit into the plexi. You get great holes without distroying the plexi, even close to the edges. I hope you know what i mean. Greetings from Joachim.