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Cool idea. I also think this shoul be possible.

I am thinking of servos instead of steppers. Reason is build in encoders (ok cl steppers have it too) and the possibility to change to torque mode. So the two pulling servos in position mode doing the move and the two servos in torque mode can build up adjustable tension.

This setup than could be used as an initial meassure of the layer thickness and correct values for that.

I can imagine some kind of tape at the sides for all corrections. Like the tape on the shaper woodworking cnc handheld machine (dont know the exact name right now). This way you can use a camera like system an be on track all the time I guess.

Cool, just ping me in here when you have time and need help getting things setup!