I was talking about myOX and, out of no where, we wondered just how small an OX could be. Sure, it is fun to have a 4' x 2' or even bigger OX in the garage, like myOX, but just how often will it need to be that big ? So I am thinking about a babyOX made of 20x20 V-slot only, maybe 20x40 for Y and X support rails ... NEMA 17 or maybe NEMA 14 all around along with the usual hardware and electronics and small/good 'dremel' type device to stay light weight as well. This should bring the size down to about 1' x 1' overall ? The limiting factor really is the spindle (smallest with enough torque) and the tool (easily available w/out going to custom made). The rest is to have enough structural strength to be consistant and precise. Portability would be key reason for 'smallest' possible OX. A babyOX with a work area of no more than 6-12" in both X and Y would probably be great for a lot of people needing to do small parts for hobbies like RC, jewelry and the likes. Using the OXcalculator for the larger scale OX designs shows the bulk of the cost is not the V-slot itself but rather the steppers, electronics, power supply and hardware to hold it all together not forgetting the spindle and tools to actually put the OX to use. A babyOX and even more a tinyOX woud need a lot less structural components, so cost should drop quite a bit (?) How small is your OX ? What are you using it for ?