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Thanks!

After playing with the SVG file you sent I realized that I just had to do an un-group in inkscape after importing the pdf.

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I had also noticed carriage stutter/shaking in some cases, which I tried to capture in the following slow-mo video: http://www.youtube.com/watch?v=YR4lfTiA9Qg. Chris, is that similar to what you saw?

Windell should know better, but my initial guess was that it might be a consequence of trying to follow the irregularities in human drawn lines since the carriage otherwise moves super smoothly when translating with the pen up.

I am also going to see if tightening the string and increasing the motor current has any effect.

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I had completely missed the sliders. Are they custom designed or some kind of standard order part? I will try to get a closer look at them when I visit your shop next. I also got a little curious… does the friction matter where they rub against the wood? Are they perhaps rolling on bearings?

And the Polargraph drawing machines made my day… :-) thanks for sharing that! 

That probably must be the simplest way to setup a pen plotter. I suppose Sandy could also have just used the EiBotBoard.

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