Is there any european reseller for LR3 parts, like there was for the MPCNC?
You can find the list of authorized resellers here:
It looks like there are lr3 parts in the ebay listing. I didn’t look too closely though.
Druckerservice Allgäu does it in Germany, his ebay handle is Optimus Prime or sth like that. 
Here is a link for the LR: ¡NEW: LR3 - MPCNC LowRider V3 - CNC Fräse - 3D Druckteile - 25mm Version | eBay