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Michael Laws at "Teaching Tech" on youtube has some excellent videos about the Ender-3 and really knows it cold. All sorts of more complex upgrades there too, should you wish to go there in future.
Hi Per, first good news,I have got a response to my ticket already and they do offer a replacement card board with display/touch screen.So let´s see which way they do offer to get it as soon as possible. My hope is, that there are spares in the European warehouse available too.