Okay not to be too draconian but this is a terrible tool. I've used an arsenal of tools my whole life, I've developed my own tools, and I'm pretty sure in this particular case it's the tool and not the user. The edge is dull, and even with a lot of pressure, all I could do was score the plastic (standard 1/8" acrylic) (the depth was so shallow it would require an atomic force microscope to measure). With strong metal lead, lots of passes, nada. I sharpened the tool, it didn't work. Maybe others will find this tool useful, in which case I'm delighted with their skills and success, but this guy, sorry, I recommend a strong transfer.
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