Interesting. The routoutcnc guy is still around, and he said that he would soon have a new batch of the drivers in stock. In the meantime I bought a new DM542T driver and wired it in for my X axis. Tested it and was still losing steps on the Y so decided to order another DM542T for the Y and wired it in yesterday. The whole thing taken quite a lot of moving things around in the big black control box, and troubleshooting and head scratching and even now I’m faced with issues (in Mach3, I think). I definitely see the benefit in just going with the routoutcnc driver that just screws in, but the max current of 2.5A coupled with me not knowing the origin of the lost steps issue pushed me in the direction of a new driver. Hopefully I can get it working, if not then I’ll replace the BoB and get another driver for the Z.