Some issue on Z Level…but finaly see some circle on paper! ! Qrv2 work igus rods and lm08uu. I think need some weight on little
Emm is concentric infill… to big 2cm to small 
Ok boss before want calibrate Z but for a 4500mm sec is a nice circle
Now take my son from school after show it at amazing acceleration :)… impossible to print without instant fluid…but surely can use this velocity for laser synthetic