I love to build stuff that does not exist yet. Even better if it has steppers, nixies, or penguins.
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Heated wire... that would just burn the house down, because masking tape is made from paper. But might be worth a try for variations using electrical tape, anyway, thanks for the suggestion. The link to the modified Grbl is in the left column, just do a Ctrl-F for "Pen Servo".
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maybe you can use an heated wire for cutting the tape
also please inform me about the grbl variation for using the up/down servo