hand guided

it's the guidedhand's free and open source solution, remade from 0, and with a modified version to block the height axis so as not to damage the pen.

part:
https://amzn.to/4idNx7Q 12mm LM12UU Linear Motion Ball Bearing
https://amzn.to/3ReQOb1 M3 Thread Inserts
https://amzn.to/3XUuQhi M3 Screws
https://amzn.to/3FMz1W5 M8 x 40 mm Stainless Steel
https://amzn.to/4iAJ136 M8 Stainless Steel Nut
metal bar 12mm 42cm x2
metal bar 12mm 41cm x1 or x2
wooden board MDF 42x42cm