This is a small box with a press fit lid to cover the CCM2 DC speed controllers usually used for fans. I use them to control power wheel motors. I switch out the POT for a pot "gas" pedal.

Link: https://www.aliexpress.com/item/32954953723.html?spm=a2g0o.productlist.0.0.13365039sVx5S5&algo_pvid=e3de1442-babe-4f57-9432-32c34f45a869&algo_expid=e3de1442-babe-4f57-9432-32c34f45a869-12&btsid=5a6de6dd-dca2-4945-9cdd-bb3136bb3284&ws_ab_test=searchweb0_0,searchweb201602_6,searchweb201603_53

Print instructions

No supports required and as much or as little infill as you want. I make it solid because its getting taped inside a powerwheels.