I've been looking at options for railing for steel v wheels such as rm2zz or rm2-2rs. I realize aluminum rails are not the way to go, but most case hardened steel rails are super expensive. PBC linear seems to be the cheapest option, but still expensive. They have rail on amazon and zoro. I've gotten a quote from them about their steel rail IVTAAB series, but that is around $3 per inch. Takes out a lot of the hard work of alignment, though. So, has anyone used v-slot with steel wheels, and adding a 0.75 or 0.5o inch steel angle between the wheel and v-slot? Or would it be slightly better to use cold-rolled square mounted at a 45degree angle in the slot to make a rail (closer to the bottom left photo, but with square rather than angle)? I've heard cold rolled would have slightly tighter tolerances (fyi, I'm thinking on order of 0.01mm precision as a goal rather than 0.0001mm, at least on my machine). Could either option work via jbweld? Or perhaps some properly placed screws? I could see gravity holding in the top I don't think I've seen too many options. The angle iron idea would be similar to the photo second from the left on the bottom. The v-slot would then be underneath, and the same thing would repeat on the bottom. The reason I ask, is because two 1000mm and one 1500mm 2060 vslot pieces, along with the six steel angles, would still be around half the cost of several other options I've looked into. In some cases, 10x less... Would something like this "work" but be an order of magnitude away from a proper linear rail and cause lots of problems? This is a hobby, so don't want to go overboard on one part of the system (nema23 motors, thinking 9mm gt2 belts). Just for more information, I already have two 1000mm and a 1500mm 6090 extrusion I picked up a while ago, so I'm looking for something to bolt to those. I'm not excited about drilling directly into the extrusion, so a linear rail like PBC sells would still need another piece to offset the rail (more cost). My thought was butting vslot to the 6090 is easier to do. Thanks for any thoughts.