Just to let you know what we are thinking.
Seems OK apart from me having to fund it.
First is the Duet mother board
https://duet3d.dozuki.com/Wiki/Hardware_Overview
Second is the piezo contact sensor
https://www.precisionpiezo.co.uk/shop
There are a few more things that Craig would like and me being a sucker for gadgetry, looks like some more deep research.
One of the major plans is to use linear bearings.
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)