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

1 dead on arrival Also missing one heatsink The other four are working seem to be no more noisy than other steppers I have heard

No documentation make sure whatever you are replacing they are going in the correct direction as these are opposite of the ones you might be upgrading.

UPDATE 03/21/2019 New Title says it all. Arrived early February and installed in a RAMPS board, set to 0.82MV and all good. Well, all good for about 16 hours of printing anyway. Just pulled them all out and have gone back to the A4988 after the second one failed. It is a pity as they quietened the printing down a lot with the 1/32 Micro-stepping. I am a bit surprised as I am a fan of Kingprint with with several main boards that have proven to be exceptionally reliable, but this latest batch of drivers -- not so much it seems. This is the second batch of DRV8825 I have had from them. The first lot bought in mid 2018 have been excellent and still running reliably. Will order from a different supplier and try again.

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

These work just fine. Remember to adjust the screw for what you need. If running for a long time keep a fan blowing on them or keep a few spares on hand.

These little boards are a great replacement for the standard 16 microstep driver and provide a 32 step option. If used to increase microsteps and quiet the stepper motors, Marlin software or printer settings must be changed for double the step rate or measurements will be off by 2X.

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.

Great

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

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!