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Picaxe Microcontroller
A sturdy PIC based micro that will gladly take any amount of back EMF you throw at it.
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L298 based board
I'll open the design as soon as it doesn't require extra parts soldered onto the footprint.
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Limit Switches
Using limit switches means that the printer doesn't need any firmware changes - just add a bit of gcode at the end of your print.
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Gear motor
Possibly with metal gears. I tried to print this, but it's too flimsy.
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Sweeper blade
I'm using a piece of blank PCB; a butter knife also works well.
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Traveling nut and axle
You'll have to print a blade holder, and add a spring.
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