1 Topic by bdp

  • bdp
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  • Registered: 2013-07-15
  • Posts: 3

Topic: Extruder Question

Hey just purchased a SD3 printer, seems like it has the "old motherboard."
Was curious about the printhead/extruder. I'm repurposing the printhead as a hobby project, but it seems like when the connection is broken from the red and blue cable (I'm assuming the thermocouple and heater), there is no signal sent to the xyz motors to move the printhead ...?

anyone else come across this before ?

thanks so much. so excited to start using this BEAST !

2 Reply by 2n2r5

  • 2n2r5
  • 2n2r5
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  • From: Frederick, MD
  • Registered: 2013-05-09
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Re: Extruder Question

The thermocouple (blue connector) is monitored in the firmware. If it gets disconnected, the firmware halts the job. Plenty of work arounds if you don't mind playing with the firmware.

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

2n2r5's Website

3 Reply by bdp

  • bdp
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  • Registered: 2013-07-15
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Re: Extruder Question

oh perfect, thanks so much.
whats the simplest solution ?

4 Reply by 2n2r5 (edited by 2n2r5 2013-07-15 23:40:54)

  • 2n2r5
  • 2n2r5
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  • From: Frederick, MD
  • Registered: 2013-05-09
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Re: Extruder Question

I would say the simplest thing would be comment out

#define PREVENT_DANGEROUS_EXTRUDE

and change


#define HEATER_0_MINTEMP 5 -> #define HEATER_0_MINTEMP 0

#define EXTRUDE_MINTEMP 150 -> #define EXTRUDE_MINTEMP 0

If you are planning on using this for a router or some along those lines, then you might be putting new firmware on anyways and this won't matter. Just make sure you don't run your machine with hotends using this configuration. This will break something if you do.

SD3 w/ mods:
Glass bed with QU-BD heat pad upgrade, threadless ballscrew w/ 8mm smooth rod, spectra line belt replacement, lawsy MK5 extruder, Lawsy replacement carriage, E3D hotend, Ramps 1.4 w/ reprap discount controller, DRV8825 drivers, 12v 30A PS, Acrylic case, Overkill Y-idlers, Filament alarm, Extruder fan + more.

2n2r5's Website