Review on Iverntech MGN12 700Mm Linear Rail Guide With 2 MGN12H Stainless Steel Black Carriage Block For 3D Printer And CNC Parts by Austin Hearshman

I used this on my Tevo Tarantula for the X axis. I had some trouble because I looked at the holes in the rail and thought they used the same M4 screw and T nut system that the rest of the Tarantula and virtually all 2020 and 2040 extrusions use. Plus, I saw no mention of any difference in the product info. So, I tried to get a M4 to fit and it looked a little tight. I decided to try my brand new drill press out. I set it to 650 rpm, and tried to drill the holes out a bit. Boy is my wife mad! This rail is built from such incredibly hard steel that a drill bit exploded and sent shrapnel into my right arm! I went through 3 more bits before I gave up after only 1 inner hole was cleared. Wow, talk about tough steel. Slides nice, too. Despite being injured I would still recommend these but I will mention that they should advertise that they are supposed to use M3 bolts and T nuts, NOT the normal M4s. Going to save up my courage to see if the wife will look past the injury to allow the $60 to buy the 2 more 400mm units I need for my Z axis - I might need first aid just asking her LOL.