Has anyone ever had an axis skip steps when moving slowly, but not when moving fast? I recently started a print with Gcode produced with the default, slow first layer settings of slic3r, and suddenly found my MM1.5 x-axis losing steps like crazy. My guess is that it’s increased friction on the linear bearings at low speed, since it’s mainly at one end of the x-axis’ travel, and I’ve noticed the slack end of my belt getting noticeably slacker when the steps are lost. Thing is, the belt briefly gets so slack that I wonder if the motor is somehow jumping around insanely on its way to stepper motor heaven. To first order, it doesn’t seem to be the pololu… Anyone have any ideas as to whether it’ll be the stepper or the bearings? I’d much rather it be the stepper, since pulling the x-axis on a MM1.5 is gonna be a pain. 
“Static friction”, you might just need to lower the Jerk value a bit.
Would the jerk settings have much of an effect? This happens when the x axis is in continuous motion, from one side of the bed to the other (it does so asymmetrically, as well, fwiw). It may well be static friction, since when the carriage moves slowly it might actually come closer to stopping between steps, whereas at higher movement rates the carriage’s inertia could prevent the bearings from stopping.
Of course, this means that I’ll probably be taking my x axis apart after all. I’ve gotta redo the x-ends so that the smooth rods can be lifted, rather than slid out of them. That’d make this job less of an overhaul.