Quote Originally Posted by magicniner View Post
Closed loop steppers are a solution looking for a problem, correctly designed open loop systems don't lose steps, if that can happen on a machine then it's badly configured or broken.
Closing the loop doesn't make a bad machine good, using the correct motors & screws and running it within it's limits does.
While this is true generally, closing the loop with servos definitely makes machine faster. I also am not fan of the closed loop steppers price wise.

But if the machine will be machining Metal i dont see why at all there is a discussion for sth else than servos and closed loop. Given the price of aluminum material that will be machined and eventually a mistake made.