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Are you sure you've selected the correct COM port?

Thanks for your comments. Yes, you are correct, the original springs had more compression room left. However, those particular springs were so stiff that it wasn't possible to easily adjust the bed...

I managed to fix the problem by using shorter screws and springs for the bed height adjustment.

http://quantalume.com/images/Zheight2.jpg

I recently finished building a Prusa I3 variant, the JG Aurora A-3. Upon homing, the Z axis zero is a bit too low, about 5 mm below the bed height, even with the bed adjustments lowered about as low...