Link to replace servo motor penplotter

Author: SimonVanherweghe

src/content/docs/plotter/index.md

@@ -6,3 +6,8 @@ description: A guide to the plotter.
 ## AXI draw
 
 The [AxiDraw plotters](https://axidraw.com/) are --besides their purpose to be used as a signature or handwriting machines-- widly adopted by digital artists who plot their work on paper. By combining anything that can draw with anything that can be drawn on, the possibilities are endless.
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+### Maintainance
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+Occasionally, the pen-lift servo motor breaks down. For reference [this is how to replace one](https://www.formlab.schoolofarts.be/instructions/doku.php?id=axidraw:axidraw#maintenance)