Pure Cold Extrusion (literally)

scaramouche

Does anyone know how to setup cold extrusion?

I use my delta printer to print porcelain using a deltawasp clay extruder which means there is no hotend or heated bed so I need to be able to start the extruder motor without it checking the thermistor temperature (I don't have one)

If I select "no tool" in the config file then I get:

Error: Attempting to extrude with no tool selected.

If I define a tool with a "zero" temperature, I get:

Error: Temperature reading fault on heater 0: unknown temperature sensor channel

I realise that most of you guys are printing filament but would appreciate any help you can give

Cheers

token47

https://duet3d.dozuki.com/Wiki/Gcode#Section_M302_Allow_cold_extrudes

This?

Phaedrux

https://duet3d.dozuki.com/Wiki/GCode#Section_M302_Allow_cold_extrudes

Beat me to it!

dc42

If the current tool doesn't have any heaters assigned to it, extrusion is allowed always. So no need to use M302.

scaramouche

M302 works fine in a starting script or sent via console. I just wondered if there was a way of "embedding" it in the config files so that it runs by default

I'll set up a macro instead

Thanks guys

scaramouche

@dc42 thanks, I'll try that

scaramouche

@dc42 That doesn't seem to work. If I remove "H1" from the Tools section of config file (M563 P0 D0 H1) I get the following error:

" Error: Attempting to extrude with no tool selected."

So I attached a thermistor to the board just to "fool" the board into thinking there was an active heater but then I get temperature errors. And now even Col Extrusion M302 P1 is generating errors

Surely there must be a way to do cold extrusion (no heater, no thermistor) for those of us who don't want to extrude hot filament? How would you suggest I force the current tool to have no heaters attached if not in the config file?

dc42

@scaramouche said in Pure Cold Extrusion (literally):

@dc42 That doesn't seem to work. If I remove "H1" from the Tools section of config file (M563 P0 D0 H1) I get the following error:

" Error: Attempting to extrude with no tool selected."

So I attached a thermistor to the board just to "fool" the board into thinking there was an active heater but then I get temperature errors. And now even Col Extrusion M302 P1 is generating errors

Surely there must be a way to do cold extrusion (no heater, no thermistor) for those of us who don't want to extrude hot filament? How would you suggest I force the current tool to have no heaters attached if not in the config file?

Are you running very old firmware? Please tell us what version you are using.

scaramouche

@dc42 I'm using version 2.0(RTOS) (2018-06-05b3)

dc42

I think there must be something wrong with your M563 command. Try sending M563 P0 D0 from the console and see whether it returns an error message. If it doesn't, send T0 and then try to extrude.

scaramouche

@dc42 thanks I'll try it