A Raspberry Pi can be found centric to 3D printers and other CNC machines—almost since the sale of the first Raspberry Pi. Wired had an article about it back in 2013! But can a Pi cut it as a CNC brain? How fast can a Raspberry Pi toggle a digital output pin? A Pi (depending on the model) ticks along at near or just above the 1-GHz mark. So, off the cuff, you can bet it is really, really fast.
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