MakerBot Cupcake-compatible Pololu stepper driver board
thingiverse
The author desired a microstep-capable stepper driver and opted for Pololu's board featuring Allegro A4983. After several PCB iterations, they shared their final design awaiting prototyping. ExpressPCB's proto service does not include silkscreen or soldermask; thus, text was included as traces. The layout allows for potential installation of Pololu carrier board underneath due to cutouts inside U1 footprint. However, the capacitor location is still undecided. A hole in the lower right corner is for pot adjustment, and another one in the middle is for Allegro chip. Makergear provides a heatsink screw that can be held down using wire on small pads above and below the hole.
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