Quote Originally Posted by Mjolinor View Post
If your motors overheat and fail in an enclosed printer then you should buy better motors. Stepper motors are normally rated at way over the maximum temperature that will be seen in an enclosed 3D printer even if you over drive them or use microstepping. My Wanhao has been enclosed since a few weeks after I got it so that I can print ABS with no problems. It has been that way well over a year and has the cheapest crappiest steppers you have ever seen and they have not failed. I have never known a stepper motor fail due to heat and I have been designing machines that use them for over 20 years.
Mine have never failed because I don't use enclosure and have a fan at X & Y motors to prevent overheating.
If they get too hot to touch, then they are Too Hot !
(Motor failure info, from over-heat in enclosure, is from videos I've seen on internet)