There are trade-offs in both directions. The original GridBot is simple and elegant. I wanted the ability to test a more diverse set of heads and add more cooling. That evolved into the 2.5 design. It’s been about a year since I had time to work on the design. But I’m starting to test again and plan a few more updates in the coming months. Mechanically, the parts are going to be mostly the same. At least the bulk of the expensive stuff like rails, rods, belts, extrusion, power, and control systems. Once you have a printer, you can start to print upgrades.