Eat this!

thingiverse

Automate your 3D printer with a motorized filament feeder! This ingenious contraption uses the motor from an automated build platform to power the spindle. When the extruder has pushed enough filament, a switch activates to control the motor's operation for about one second - just enough for minutes of printing. The controller also features a two-way switch for manual control and indicator LEDs that signal forward and backward movement. This project is perfect for those with heavy spindles that cause extruder problems during operation, allowing for unattended printing of even the largest objects. The design involves three main parts: an engine housing the motor and related components, a controller with a motor-control circuitry, and an end-switch box to operate the motor. Materials needed include threaded rods, nuts, bolts, washers, ball bearings, a gear motor, and various electronics for the controller. After printing and assembling, simply connect the wires to a power source like a floppy disk connector on the printer's power supply.