In general stepper motors can run a predefined level above the ambient temperature. This can easily get hot enough to burn you. The best way to be certain is to check a data sheet or contact the manufacturer, measure your motor temp and compare. I used a meat thermometer to measure mine though it was probably somewhat hotter. Also it might be a god Idea to run your motors at less than their rated amperage(80%?). You should see a marked drop in temperature with only a little drop in performance. Better safe than Motorless.