I have recently finished putting together a prusa mendel i2. I get motor jitter(z axis) when both are connected to ramps but with one connected it moves fine. I am using a 12v 20a power supply. My question is, is it a power, ramps or motor issue? It is very frustrating. Any help will be very appreciated. Thanks, Keith https://reprap.org/forum/read.php?4,408978,408978#msg-408978 Wed, 07 Oct 2026 23:39:22 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,408978,409203#msg-409203 https://reprap.org/forum/read.php?4,408978,409203#msg-409203 Here's the reprap wiki page for a4988 pololus. Make sure your drivers are pololus and not stepsticks, though, as the vref will be different.

Basically, plug your board into your PC and check the voltage on the board with positive on the pot and negative on one of the negative terminals on the RAMPS.]]> Anonymous User Reprappers Fri, 19 Sep 2014 03:05:46 -0400 https://reprap.org/forum/read.php?4,408978,409156#msg-409156 https://reprap.org/forum/read.php?4,408978,409156#msg-409156
Thanks again.]]> urable2 Reprappers Thu, 18 Sep 2014 21:58:41 -0400 https://reprap.org/forum/read.php?4,408978,409095#msg-409095 https://reprap.org/forum/read.php?4,408978,409095#msg-409095 Anonymous User Reprappers Thu, 18 Sep 2014 16:12:31 -0400 https://reprap.org/forum/read.php?4,408978,408978#msg-408978 https://reprap.org/forum/read.php?4,408978,408978#msg-408978
Thanks,

Keith]]> urable2 Reprappers Thu, 18 Sep 2014 11:54:16 -0400