actually don't recommend these, this cheap cnc machine is a bullshit that i will take it apart for building something else. tried a while find out the manufactured size, but i put most of the hole sizes in a much smaller tolerances, which makes it still works, but need to adjust a bunch to make it work. but anyway, maybe somebody will need these thro. p.s. the case shape i strength it way too much that two of the step motor mounting screws are pain in the ass to put it in, but still able to do so.