seems i really need more accurate Z , but now at least the belts are properly tightened and the partcooling happens by the printer, not a external fan :)
https://nurdspace.nl/CoreAnet
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https://www.youtube.com/watch?v=kLQJqKvs8nA
Another video just surfaced of our nice iBeamer installation back in august.
See http://events.ccc.de/camp/2011/wiki/IBeamer for more information
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https://www.youtube.com/watch?v=srSDJifMtWg