Geeetech

Very careful to not haveing static charge by holding the edge of the pcb with gound strap.
Defective product shipped from Geeetech!!

4 out of 5 is working OK. swapped the failed one to the working one at the same position result in fail to change the direction: you shipped a non working drive. need a replacement

I order
5pcs Pololu DRV8825 with 5 heat sink for RAMPS1.4 Sanguinololu Teensylu
4pcs is working properly.
One piece can rotate, but changing direction is not working.

Need replacement.