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Steps per mm for each extruder M92

Posted by orictosh 
Steps per mm for each extruder M92
September 01, 2016 11:30AM
Upon my Duel extruder Ormerod 2
I have an original geared extruder and a direct drive extruder
The steps value is 426.871 for the geared one and 95.055 for the direct one, when asked to extrude 100mm.

Does M92 E support another extruder, so in my config.h file file I can have E0(steps value) & E1(steps value) ?
I would like to be able to set-up each one with the required steps_per_mm value

Firmware Name: RepRapFirmware
Firmware version 1.11-ch (2016-04-08)

Thanks for your time
Chris


Supporting 3D Printers with Parts and Build services.
Printer: Ormerod 2 (528.4) Duel extruder set-up with Aluminium X-Rib, RRPro Firmware v1.11-ch (2016-04-08)
Re: Steps per mm for each extruder M92
September 01, 2016 12:56PM
Well, you can specifiy the number of steps per mm for each extruder drive by separating each argument using a colon like

M92 E426.871:95.055

You have to specify the E steps per mm all at once every time you set them. It isn't possible to set them for a specific drive only.
Re: Steps per mm for each extruder M92
September 01, 2016 02:33PM
Quote
chrishamm
Well, you can specify the number of steps per mm for each extruder drive by separating each argument using a colon like

M92 E426.871:95.055

You have to specify the E steps per mm all at once every time you set them. It isn't possible to set them for a specific drive only.

Thanks chrishamm, Looks like if I reverse the values in that statement and place it inside the config.h so that E0 is 95.055 and E1 is 426.871 It should give the correct number of steps per mm for each extruder.
Currently if I ask the direct drive extruder to go 100mm it goes a lot further than needed and geared one moves the correct distance when only using one value that statement.

Chris


Supporting 3D Printers with Parts and Build services.
Printer: Ormerod 2 (528.4) Duel extruder set-up with Aluminium X-Rib, RRPro Firmware v1.11-ch (2016-04-08)
Re: Steps per mm for each extruder M92 (solved)
September 02, 2016 05:33AM
Thanks for this.
I have just added the above statement to my config.h file and now have 2 extruders which feed the correct amount when asked.

Maybe someone could update the wiki g-code statement to show the colon method of setting up 2 extruders; one direct drive, one geared smileys with beer
[reprap.org]


Supporting 3D Printers with Parts and Build services.
Printer: Ormerod 2 (528.4) Duel extruder set-up with Aluminium X-Rib, RRPro Firmware v1.11-ch (2016-04-08)
Re: Steps per mm for each extruder M92
September 02, 2016 07:54AM
I would think you will need to reduce the print speed quite a bit with that direct geared extruder because it will be a lot weaker so you'll get skipping at a far lower extruder speed.

Dave
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