So this is not the most graceful or successful attempt to draw a RepRap logo with a μ in the middle of it, but you can see where I'm headed. It was meant to be 400μm tall but looks a little less. The calibration squares are 50μm on a side. What I think is happening here is that I'm driving the point firmly into the substrate and actually bending the point around as the slide moves.
The cool part though is that this was controlled from the standard cncjs app, so I'm eliminating all my dodgy homebrew interface.
That's what I can do with a standard hypodermic needle. Now I have a little more confidence I'll give one of my fine points a go next.
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