Filament snag de-headacher

by infodude, published

Filament snag de-headacher by infodude Dec 8, 2012
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My filament often snags and gives me headaches and breaks things. This is a faiisafe


Mounts a microswitch behind the Metric Prusa Clip on Filament Guide thing:18889.

Clamp an M8 bolt to the Z-rod top using a bar clamp.
Aim the bolt at the back of the filament guide, and mount this on the bolt end.
Bolt a microswitch onto it and wire it to the killswitch input (I have an LCD thing so I hijacked pin 63 on aux2 on ramps).

When the filament snags it bends the guide back, and just before it snaps the printer stops. More peace of mind for unattended printing.

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how do you use the microswitch to pause the printer... i mean how do you send command to the firmware to pause?

Look up the killswitch pin number in your firmware - if it's somewhere on the RAMPS board (or whatever yours is) that is reachable, then use that, else choose another pin but you'll need to re-compile your firmware.

Then just connect a wire from the killswitch to a ground pin, and the other wire to the chosen pin. When it's triggered it causes a firmware PANIC!

but is there no solution just to pause it rather than kill the entire print?

I agree that would be much better, but I haven't got into the firmware enough to do that. As it is it saves my printer from pulling itself apart so it only gets two cheers from me ;)