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IMG_5916.JPG heli 1Thumbnailsfoyer stairsheli 1Thumbnailsfoyer stairsheli 1Thumbnailsfoyer stairsheli 1Thumbnailsfoyer stairsheli 1Thumbnailsfoyer stairsheli 1Thumbnailsfoyer stairsheli 1Thumbnailsfoyer stairs

The grbl controller; underneath this stepper driver is an Arduino Uno and a breakout board.