I got myself a nice little linear rail from smalltec.de for 50 bucks:
This will now serve as the z-axis and also provide suspension so that the pen will have more or less constant pressure on the paper. The parts for attaching all the stuff were made from brass strips that I cut down to length, drilled and soldered together with a gas torch:
It works great and is very stiff, so much in fact that I noticed how bendy the 1m long arms are, but nevertheless v2 is a big improvement.
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