Custom build board questi8n Can i put 12s 44.4v on this board and will make more speed ?

I donĀ“t think that the built in ESC can handle 12S. Only the VESC and some really expensive Hobby ESCs can.

Did anyone else notice the weird controller?

It seems like DIY but hard to tell. I had this guess because the side does not look very smooth. more like stacked lines from a 3d printer

Yeah, I had the same impression.

This board has a 6s max ESC. Basically the 120a 6s FVT. I bought one of their thumb controllers, you know, for science. It is 3d printed.