So I am setting up my CoreXY build and the motors will not turn.. When I try to move them using Repetier Host, all that happens is they make a loud buzzing noise and vibrate. I have Vref set 0.8 V, which I would think is enough.

Here are the motors I am using: [www.ebay.com]

I am using DRV8825 drivers in a RAMPS 1.4 with Marlin.

Both motors do the same thing. and the z motor just doesn't move at all.

Any ideas what is wrong?

Thanks.

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greghoge.com

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You might have the wrong connection order when you soldered your own extension cables?
For your RAMPS it is
2B 2A 1A 1B.

But your motors are

Quote

PIN1= B-
•PIN3= B
•PIN4= A
•PIN6= A-

So you should try
2B = B-
2A = A-
1A = A
1B = B

-Olaf

Edited 1 time(s). Last edit at 06/04/2015 04:06AM by o_lampe.

I didn't use extension cables., but I'll double check that because I think they wiring for my new motors is slightly different than the previous ones (which moved, albeit very roughly).

Edited 1 time(s). Last edit at 06/04/2015 03:59PM by gmh39.

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greghoge.com

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That was it. Took some guess and test, but finally got it.

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greghoge.com

HUGE 3D PRINTER PARTS SALE!!!