@ettienned
Some good work there using a PIC16F628A to drive the steppers,
did you fabricate those yourself? Massive heat-sinks.
I see 2 light bulbs, possibly used for early testing of the drivers,
or to load the 3.3 / 5 volts of the PC supplies,
I understand PC supplies can become unstable (or have lots of noise/ripple) if not lightly loaded.
I'd be interested In how you interconnected the 2 PC power supply's 12 volt outputs together to get 24V,
any special circuitry to do that?