The motors chosen are NANOTEC ST4209M1206-A 400 steps / revolution stepper, in NEMA 17 format.
They are 0.85 A / Phase in bipolar series, under 5.6 V.

In order to house the power plugs (I chose Tiny XLR 4), a support will be cut on the F1 CNC. It will be fixed to the back of the engine by two M3 screws, which will be removed, drilled and tapped for the occasion.