So I installed the new motor and it is extremely loud and it runs really warm. So warm that it melted some of the nylon standoffs.

I lubed all the guide rods and tightened all my screws and am still getting a really loud motor/printer. Now I am looking to purchase another motor and found the following website:

http://www.omc-stepperonline.com/ste...rs-c-1_21.html

Am I looking to purchase a unipolar or bipolar motor?