I'm driving 2 of these
[www.shadowram.ca]
with the RAMPS 1.4 and A4988 Pololu driver, with the pots at about 30%.
No issues, But I have heat-sinks on them, and a fan blowing on them.
Also my setup might be lower resistance to move around than some of the standard RepRaps as the X and Y are on rails with rollers, instead of linear slides.
[www.shadowram.ca]
with the RAMPS 1.4 and A4988 Pololu driver, with the pots at about 30%.
No issues, But I have heat-sinks on them, and a fan blowing on them.
Also my setup might be lower resistance to move around than some of the standard RepRaps as the X and Y are on rails with rollers, instead of linear slides.