Re: Geeetech products warning...
I purchased their Delta Rostock G2s Dual Extruder printer, and Geeetech definitely seems to have an issue with quality control.
The sad part is, if they actually took the time to fully vet their suppliers and demand quality parts, their designs would work fine.
.. and would probably only cost about $20/$30 more.
An example - the acrylic top of the G2/G2s needs to be 8mm-9mm for the frame to hold tightly together, but I received a 7mm piece. Only took a trip to the hardware store and some well placed 1.5mm thick washers, but for the non-mechanically inclined, this would be a showstopper.
I have modified their Wiki page on reprap.org (http://reprap.org/wiki/Delta_Rostock_mi … embly_Tips) with the assembly modifications I needed to do to make it all work, but now that I have done that, it prints nicely for a $350 machine.
At least, it prints nicely enough to print parts for a better (homegrown) machine!