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When I saw this 12v Door Lock actuator for $5, I immediately saw the SpayMaster!
You can get all parts for under $30. All of the screws are M5 size, except the long M3x50mm.
Print the parts in just 2 hours on any cheap printer. This design can stand alone with any microcontroller, or you can add it to your SCUTTLE Robot! I hope you get creative with this and make a new application ☺
Video Overview on Youtube
Design Files on grabCAD