Thank you for reply, I'm using M3d Micro with standard PLA..
I'm going to try Octofiber PLA, to see if this gives me better results...
and maybe M3D ABS-R filament (didn't try yet). A post about it here: http://goo.gl/GLKJno

for this you need a filament witch is tough, but has slight bending properties....
(without breaking )

André