Ummagawd Botgrinder Grinderino 3.5" Freestyle Frame KitIntroducing the Grinderino. If you love your Demibot, but wish you had one that's juuuust a little smaller, your wishes have been granted! When Botgrinder asked if we can make him a 3. 5" frame, he said he wants something just as good as the Demibot but in a smaller package. It took a bit of adjustment, but I think we hit the mark. As for flight controllers, this frame will fit a single board whoop style AIO, or a 20 x 20 stack. The rear of the frame