A way to screw MGN12 rails onto 3030 aluminium profiles. Enjoy!

Update 2009.06.18.
Made the tolerance tighter with standard M3 nuts in order to avoid stripping and rotating the nut inside the plastic. Now it requires minimal hammering into PETG (or heating up before inserting). Print with 100% infill and a little bit less flow than normal and it will be strong, would not crack.