<![CDATA[SoliForum - 3D Printing Community — Pololu DRV8825 drivers]]> 2013-08-25T14:29:28Z PunBB https://www.soliforum.com/topic/3545/pololu-drv8825-drivers/ <![CDATA[Re: Pololu DRV8825 drivers]]> FWIW, I replaced the extruder driver (only) with a DRV8825. Seems to work fine with 0.24V for limit.  Did several prints (but only one with long straight walls so far), helps significantly with moire.

No moire, so the 1/18in wobble is noticeable again (which had almost disappeared after a simple anti-backlash, or so I thought), esp in .2mm prints.  Perhaps it's time to stop postponing Z-axis hacks... smile

]]> https://www.soliforum.com/user/1993/ 2013-08-25T14:29:28Z https://www.soliforum.com/post/34224/#p34224 <![CDATA[Re: Pololu DRV8825 drivers]]> ronsii wrote:

Here is Adrian's post about the vref settings ---> http://www.soliforum.com/topic/2817/ste … ref-chart/

Thanks.. So same limit. Weird, though, Pololu says limit = Vref*2 forDRV8825 and Vref*2.5 for A4988, so it seems to me multiplier should be 1.25, not 2 as table suggests (based on R2/3 values). Anyway, I'll give it a go..

]]> https://www.soliforum.com/user/1993/ 2013-08-16T15:18:49Z https://www.soliforum.com/post/33203/#p33203 <![CDATA[Re: Pololu DRV8825 drivers]]> Here is Adrian's post about the vref settings ---> http://www.soliforum.com/topic/2817/ste … ref-chart/

]]> https://www.soliforum.com/user/296/ 2013-08-16T14:57:27Z https://www.soliforum.com/post/33199/#p33199 <![CDATA[Re: Pololu DRV8825 drivers]]> Have one on order, quick question: what's Vref set to? Same current limit (which would be .192V * 2.5/2, if not mistaken) or higher? TIA

]]> https://www.soliforum.com/user/1993/ 2013-08-16T12:38:43Z https://www.soliforum.com/post/33171/#p33171 <![CDATA[Re: Pololu DRV8825 drivers]]> You can replace just the extruder if you want. This will definitely clean up those straight walls. That is what I use.

I have a complete set but that is because I am a bit over zealous when it comes to upgrades. 

You shouldn't need to change your jumper configuration on the board. 1/32 uses the same configuration as 1/16 of the a4498. You will need to change your steps/mm in the firmware. It should be double what you have now.

As always, check for more information on the forums.
http://www.soliforum.com/post/18295/#p18295

Good luck. I really like this mod.

]]> https://www.soliforum.com/user/1906/ 2013-08-14T12:15:15Z https://www.soliforum.com/post/32888/#p32888 <![CDATA[Pololu DRV8825 drivers]]> Hi guys,
I see some of you are replacing stock stepper motor drivers with DRV8825 that allows 1/32 microstepping.
As I'm interested in erasing moirè effect I see on straight walls, I'd like to replace the extruder driver.

Is it possible to replace just this driver or shall I replace all of them?
Does it make sense to buy a complete set of drivers or one spare is enough?
If I understood correctly to enable 1/32 microstepping is a matter of shorting the right pins like the datasheet says, or do you need to alter anything in the firmware too?


Thanks !

Nick

]]> https://www.soliforum.com/user/2336/ 2013-08-14T09:46:22Z https://www.soliforum.com/post/32875/#p32875