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setting the stepper driver current

Hi. I've seen a few mentions on here of setting the stepper driver current.

Could someone please point me in the right direction to find out how to do this?

There is explanations of setting the voltage with a multimeter but I cant see anything about setting the amps, or how to convert from one to the other.

Many thanks

10 comments

10 Comments

Robin Benford

Apr 04, 2022

Thanks for the info. Do you just copy and paste this whole list into the Cura start G-code window?

Craig Petre

Apr 04, 2022

Replying to

@Robin Benford I did them one by one into the terminal on the printer or could do them through octoprint. Then I saved them to the eeprom with command M500. Then you don’t need them in your start gcode.

Craig Petre

Apr 04, 2022

Replying to

I will likely reduce my current. I’ve heard rumors the stepper on the orbiter can burn out... though I haven’t actually done the research to confirm this. I think others have had luck in the 500-600 range so I may reduce to that.

Craig Petre

Mar 30, 2022

I also went here. If you scroll down in the post it shows recommended configuration settings and the gcode needed to apply them:

www.thingiverse.com

The Orbiter v1.5 140g Dual Drive Direct Extruder by lorinczroby

Hi everyone! As many of you was expecting this is The Orbiter v1.5 high precision extruder design. This extruder version was designed in cooperation with LDO Motors and Vivedino, without their great support this product would not exist!Special thanks to the Voron community to make this design so popular! HOT!!! Check out the new filament sensor add on with filament auto loading and unload button! Visit our official webpage: https://orbiterprojects.com/ Click here to join our Facebook support group!New Orbiter F2.85 for 2.85mm filament Short Spek: Gear ratio - 7.5:1 12 mm diameter filament pushing gears Filament pushing force: LDO-36STH17-1004AHG 17mm stepper up to 7.7Kg LDO-36STH20-0504AHG 20mm stepper up to 9.4Kg LDO-36STH20-1004AHG Filament acceleration up to 600mm/s^2 Retraction speed: 60mm/s(24V power supply), 30mm/s (12V power supply), 120mm/s(LDO-36STH20-1004AHG) Overall weight is about 140g (with the 17mm stepper) Maximum operating temperature ~120 C Main differences to V1: DuPont Delrin molded planetary gears; Glass fiber reinforced Nylon housing and latch; Filament exit guide part of the extruder housing; PTFE tube connector on top; New stepper option LDO-36STH20-1004AHG - 20mm long with more torque. some internal bearings dimension has been changed to simplify assembly and improve the molding process quality. Of course you can still print all the parts by yourself as in case of the v1.0, but the aluminum spider shaft is still recommended. Please be aware that the mounting footprint of the V1.5 is slightly different from V1, so all the adapters need slight changes. I will take care of modifying all the supports I have designed let me know if you need some support or adapter design which is not existing yet.

This section in particular: 2.2 Marlin Firmware configuration

Send the following commands via USB: M350 E16 ;micro stepping set to 16 M92 E690 ;steps/mm - you may need to finetune it M201 E600 or E800 ;acceleration mm/s^2 M203 E30, E60 or E120 ;max speed mm/s M205 E10 ;E jerk mm/s M906 T0 E350 or E850 ; TMC motor RMS current mA M907 E350 or E850 ; motor RMS current mA M900 T0 K0.22 L0.4 ; linear advance values TBD M900 T0 S0 M207 S1.5 F3600 or F7200 Z0.2 ;firmware retraction M500 ;save settings to EEPROM

You'll find that some of those gcode functions aren't implemented, but the important stuff is there. For the printer I got at least (maybe true for all of us?), the model matches this list:

1.2 Stepper LDO-36STH20-1004AHG(new)

Motor current: 1.2A Peak or 0.85A RMS Acceleration: 800 mm/s^2 Retraction speed / max speed: 120mm/s Operating temperature: 60-70°C

Robin Benford

Mar 29, 2022

Thanks for your help. Will try.

Robin Benford

Mar 29, 2022

Thanks. I'm not at all knowledgeable about marlin. Can I get into marlin and keep the same touchscreen etc? I'm close to giving up on this printer. Now it extrudes for a couple of minutes then jams.

This printer definitely needs more knowledge than I have I was stupidly expecting it to work without all this tinkering.

Johannes Weis

Mar 29, 2022

Replying to

@Robin Benford you're using Marlin already, so you can keep the touchscreen ;)

You should set the extruder current to 500-600mA, though. Else it’s not getting enough power to reliably push the filament.

Robin Benford

Mar 31, 2022

Replying to

@Johannes Weis

Thanks Johannes. Could you also tell me the current I should set the X and Y steppers? Also do you think the dragon hot end is a good upgrade?