There's one glaring flaw: the micro-stepping jumpers don't work because they connect to ground instead of vcc. I had to modify mine. I removed all of the ground-side pins from the jumper pairs, then made a wire that reached each stepper driver's remaining jumper pins. One end of the wire connects to the +5v on the board and each of the other three ends was soldered to a jumper, which allowed me to send voltage to one or two pins on each stepper (I was able to enable 8x microstepping, which was fine for me). As for the flaw that another buyer mentioned, with the "step" and "dir" pins being reversed, you don't necessarily need to modify the board for that. Just compile your GRBL with the "config.h" file listed in the link on Banggood's CNC Shield product page. Overall, I'm happy, now that I got it working. The Arduino and the stepper motors seem to be flawless so far. And it only took 2 or 3 weeks to get to Ottawa, Canada via regular mail, so that's not bad.

There's one glaring flaw: the micro-stepping jumpers don't work because they connect to ground instead of vcc. I had to modify mine. I removed all of the ground-side pins from the jumper pairs, then made a wire that reached each stepper driver's remaining jumper pins. One end of the wire connects to the +5v on the board and each of the other three ends was soldered to a jumper, which allowed me to send voltage to one or two pins on each stepper (I was able to enable 8x microstepping, which was fine for me). As for the flaw that another buyer mentioned, with the "step" and "dir" pins being reversed, you don't necessarily need to modify the board for that. Just compile your GRBL with the "config.h" file listed in the link on Banggood's CNC Shield product page. Overall, I'm happy, now that I got it working. The Arduino and the stepper motors seem to be flawless so far. And it only took 2 or 3 weeks to get to Ottawa, Canada via regular mail, so that's not bad.

There's one glaring flaw: the micro-stepping jumpers don't work because they connect to ground instead of vcc. I had to modify mine. I removed all of the ground-side pins from the jumper pairs, then made a wire that reached each stepper driver's remaining jumper pins. One end of the wire connects to the +5v on the board and each of the other three ends was soldered to a jumper, which allowed me to send voltage to one or two pins on each stepper (I was able to enable 8x microstepping, which was fine for me). As for the flaw that another buyer mentioned, with the "step" and "dir" pins being reversed, you don't necessarily need to modify the board for that. Just compile your GRBL with the "config.h" file listed in the link on Banggood's CNC Shield product page. Overall, I'm happy, now that I got it working. The Arduino and the stepper motors seem to be flawless so far. And it only took 2 or 3 weeks to get to Ottawa, Canada via regular mail, so that's not bad.

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