My plotter has an issue... at a loss to what is happening. hoping someone might have some ideas! It has previously worked perfectly, but has started doing this -using same configurations and homing points.
The drawing is fine everywhere except on a triangular portion of the board like this:

The pen draws over the letters twice normally- and in the triangle section, it is dropping down on its second time around- absolutely fine everywhere else- before and after this happens.
Some images of the writing dropping:



I posted some images on the forum previously -
http://www.polargraph.co.uk/forum/polargraphs-group2/general-forum1/whiteboard-polargraph-thread247/
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