I got really excited when I mved and one of the hardware stores had that smooth conduit. For me though the stuff I got was really soft, the bearings wore flat spot in after only a few hours of use. so it made things worse when I did a lot of repetitive 3d printing and then wanted to move onto milling something large the conduit was uneven. I used it for a while and would just turn the conduit when I wanted a better cut, eventually I replaced it with sanded “rough” emt. Hopefully you found a smooth and harder version of what I have here that would be awesome!