Extruding without hotend

Guys good morning.

Today i connected trough try and error my steppers to duet . While everything seems to go fine for x stepper y stepper and also z ones the extruder doesn't turn. I touch it and it seems to vibrate ( barely noticed) but it doesnt turn .
The stepper is alright so what may the problem is . I send m302 and i assumed it was extruder 0 ( it try also T1 and M302 P1) but it didn't help either.

So do i have a problem or i am just missing something?

The firmware is probably preventing it from turning because there's no temperature input or the temperature is too low. It is probably easiest to hook the hot end up (including thermistor) and set the temperature than to go digging through the firmware to find the variables that control that behavior.

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

i am sending M302 P1 command to allow it extrude but it didnt helped. Anyway i didn't had the thermistor to set this up so i thought i could try it without . i ll wait for the thermistor and then i ll try again . But i scared of a doa duet as rpp is closed at this time .
Anyway i hope it is a software and not hardware problem.

Please attach your config.g file so that I can see how you have configured the tool(s). Also please say which firmware version you are running.

Failure to extrude in RepRapFirmware is usually caused by either cold extrusion prevention (but you have sent M302 P1 to disable that), or not having the tool selected. Other possible causes are a bad stepper motor or cable. To test for this, with the power off swap the E0 connector on the Duet with another one e.g. the X motor connector. Then power up and try jogging the X axis to see if the extrude motor turns.

There is now a dedicated forum for the Duet. Please post future Duet- and RepRapFirmware-related questions there if you want me to see them because I don't monitor this forum.

Edited 1 time(s). Last edit at 02/14/2016 04:30AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

i am running on the shipped version 1.09.

this is my config

M111 S0
M550 PRepRapPro Mendel 3
M551 Preprap
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0x14
;M552 P0.0.0.0
M552 P192.168.1.14
M553 P255.255.255.0
M554 P192.168.1.1
M555 P2
G21
G90
M83
M906 X800 Y1000 Z800 E800
M305 P0 R4700
M305 P1 R4700
M569 P0 S1
M569 P3 S0
M569 P4 S0
M569 P5 S0
M92 E660
M558 P2
G31 Z2.3 P600
M556 S75 X0 Y0 Z0
M201 X500 Y500 Z15 E500
M203 X15000 Y15000 Z100 E3600
M566 X200 Y200 Z30 E20
M563 P0 D0 H1
G10 P0 S-273 R-273

although i have the heater attached i dont have the thermistor..! also i can move all the motors ( except the extruder) but when i am sending to extrude then i can't control any motor. it seems like the duet is freezing.

i test the stepper and the cables and they work both fine.

The firmware has moved on a lot since the 1.09 release. Try my 1.09r-dc42 release, available here [github.com] (follow the link and press Raw to download it). You may need to add a M574 command to your config.g file to define the endstop switch positions, but apart from that you can leave your config.g file alone, at least initially.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

i did upload the new firmware to the duet but the extruder motor doesn't move. This time with the new firmware after i send extract command the rest of the steppers was ok but the extruder even with m302 p1 command didn't turn a bit.
I hope it is a missing thermistor error and not a chip's one.

If you want to test the driver, in my firmware fork you can remap the motors to different drivers. See the description of the M569 command in the wiki page on gcodes. Remember to turn off the power and disconnect the USB cable before connecting or disconnecting motors.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

i am a noob so i am not sure what i have to write.

is it M569 P5 X0. Assuming that the driver of the extruder is P5 ...

edit:it was M569 P3 Y0 what i send and it worked perfectly . So i assume the extruder has a limitation ( thanks God ) if there is no thermistor attached.

Thanks David Thanks A lot...!

Edited 2 time(s). Last edit at 02/15/2016 01:23AM by Gaou.

Guys all seems perfect . I plugged the thermistor raised up the temp to 200 and the extruder is workign perfeclty . So i assume that the extruder stepper wait to see if a thermistor is connected to work.

Thanks for the feedback. I would have though that extrusion without a working thermistor should be allowed if cold extrusion has been enabled, so I'll log this as a possible bug.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

David i think it is better (personal opinion) that you ll keep it that way. It is more safe i think . Ur firmware doesnt have any bugs man. All seems just perfect.