KINGPRINT DRV8825 Stepper Motor Driver Module with Heat Sink for 3D Printer Rrerap Ramps 1.4 A4988 (Pack of 5pcs)

I bought these for lab use to test/analyze motion controller behaviors only to discover that these little drivers need much support circuitry before theyll function. These drivers will also drive from their own noise, meaning once stepping has started it might never stop! These might be okay drivers for those who know them well, but if youre a first time user of these like me I say AVOID!

Works well for me. No quality problems. Would be nice to have decent instruction sheet.

Out of five tried three - first bad out of box didnt work, spent 15-20 mins thinking wires are incorrect but it was just faulty one. - second, worked for 30 second, then stopped. but at least this allowed me to figure out correct angle for register - third, worked for a minute then stopped for all heat sink was on with a CPU fan on top of the unit. Input: 12V, 0.78A

2 of the 5 units purchased were dysfunctional. 1 just did nothing, while the other got hot and did nothing other than get hot. on the plus side, the other 3 units worked as intended. buy extra I guess.

Defected on first installation. VREF is not adjustable.

Dont know if I got unlucky or what, but one of them literally exploded on me and blew a chunk of the chip out

Works fine on my genmitsu pro.

They work very well. Only issue is the adjustment screw on 2 of them does not turn any more.

They worked OK but not an improvement over stock A4988s

Cannot beat the price but it does not do much good when 1 was no good from the begin another failed in 30 minutes and so far the other 3 seem ok at this point. I have had better luck with the A4988’s