Southport UK, 6 posts in 6 years, started the rockcliffe in 2009 then tried to sell it partially built in 2010, has asked about Chinese drivers before in 2010 as well... no point in reiterating the answer, it hasn't changed. Tony, try using the search function, the Chinese question has been done to death. And if your Rockcliffe is using threaded rod a pair of cheap Nema17s aren't going to move it fast enough to cut anything harder than butter...