3.2.1. Any robot kit or building blocks, either available on the market or built from raw hardware, may be used as long as the design and construction of the robot are primarily and substantially the original work of the students.
I want to replace the EV3s Brick for my student with a similar concept I developed. I would build the replacement Brick, while the students do the programming and general incorporation of the Brick into their robots.
My question now would be to what extent this creation would have to be available on the market. Would I have to sell it, or would simply uploading the circuit diagram be enough for example?
You said you developed and build the replacement Brick by your self.
Its a your robot.
Its not robot kit and your student’s robot.
You have to fill No1 and No2 which pointed out by Dennis.
Your students should build the replacement Brick by themselves.