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Summary Fits a standard 1-1/2"(40mm) x 3/4" (20mm) single edge razor blade Use a paper clip to push the blade in and out. I use one of these everyday for work, the flat pointy end to poke through tape and the razor end to open all sorts of envelopes. I've used openers like this before but you couldn't replace the blade. Next version the blade will sit at a steeper angle. Print Settings Printer Brand: Printrbot Printer: Simple Black Rafts: Yes Supports: No Resolution: .2 Infill: 0-15 Notes: Print standing up. The orientation when loaded should be correct. I've printed with 0 infill and 15 infill. At 20% infill the outside starts to get rough.