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Hi, really a great project. Now it's possible to prepare a PCB in minutes.Though the description of the modification is very comprehensive, I managed to make some errors during adaptation of the MCU program (I used a ATTiny45 with a different timing). But Mark helped me to bring my printer to work. Thanks a lot Mark!I made some tiny changes, because I didn't get all the parts (and I had others available instead). I used a rubber drive roller from another printer. The springs are connected using cable ties. The middle rubber roller is covered with self-adhesive copper foil, to ground the carrier.