<![CDATA[SoliForum - 3D Printing Community — pulsating extruder?]]> 2016-02-07T10:57:35Z PunBB https://www.soliforum.com/topic/13644/pulsating-extruder/ <![CDATA[Re: pulsating extruder?]]> For the record, swapping an atmega644p for atmega1284p did not fix this (I happened to be doing that anyway)

I installed the 1/32 stepper driver drv8825, did some calibration of the trimpot until the extruder motor stopped choking and now the moire is gone!  Thanks all.

]]> https://www.soliforum.com/user/211/ 2016-02-07T10:57:35Z https://www.soliforum.com/post/116038/#p116038 <![CDATA[Re: pulsating extruder?]]> I don't have the 8825 yet, but your comment about jumpers and doubling extruder steps/mm has been noted for when the part is delivered next week.

]]> https://www.soliforum.com/user/211/ 2016-02-07T10:09:07Z https://www.soliforum.com/post/116036/#p116036 <![CDATA[Re: pulsating extruder?]]> If you are getting moire with an 8825 then you most likely aren't running it at 1/32 steps.  Did you set the jumpers correctly? Did you have to double your E:steps/mm?

]]> https://www.soliforum.com/user/2291/ 2016-02-07T03:29:23Z https://www.soliforum.com/post/116015/#p116015 <![CDATA[Re: pulsating extruder?]]> A4988 is 1/16, DRV8825 is 1/32.
+1 to wardjr on the Goblin. With a DRV8825 and the Hobb Goblin, a .9 motor can be overkill, though I love that setup.

]]> https://www.soliforum.com/user/4188/ 2016-02-06T16:08:23Z https://www.soliforum.com/post/115987/#p115987 <![CDATA[Re: pulsating extruder?]]> wardjr wrote:

DRV8825 for 1/32 microsteps or a .9 stepper motor. Or a HobGoblin will help with Moiré

ordered a DRV8825.  are they not all 1/32 microsteps?

]]> https://www.soliforum.com/user/211/ 2016-02-06T16:00:38Z https://www.soliforum.com/post/115985/#p115985 <![CDATA[Re: pulsating extruder?]]> DRV8825 for 1/32 microsteps or a .9 stepper motor. Or a HobGoblin will help with Moiré

]]> https://www.soliforum.com/user/2291/ 2016-02-06T15:09:57Z https://www.soliforum.com/post/115979/#p115979 <![CDATA[Re: pulsating extruder?]]> DRV8825 for 1/32 microsteps or a .9 stepper motor. Or a HobGoblin will help with Moiré

]]> https://www.soliforum.com/user/2291/ 2016-02-06T15:09:55Z https://www.soliforum.com/post/115978/#p115978 <![CDATA[Re: pulsating extruder?]]> Thanks, I adjusted the pot dial on the stepper until I could find the best spot.  It's better but it doesn't quite go away.  Is there a better stepper to be had?

]]> https://www.soliforum.com/user/211/ 2016-02-06T09:41:56Z https://www.soliforum.com/post/115971/#p115971 <![CDATA[Re: pulsating extruder?]]> driggers wrote:

I'm trying to calibrate my e3d and it seems to pulsate regularly, making patterned walls of varying thicknesses.  I also recently did a PSU upgrade and firmware update.  I don't see this problem in various print troubleshooting websites.  See picture:

http://i.imgur.com/0bWooLu.jpg

Look up motor moire, that is the cause of this and is usually a sign your vref for your extruder stepper is set wrong.

]]> https://www.soliforum.com/user/7731/ 2016-02-06T08:43:23Z https://www.soliforum.com/post/115968/#p115968 <![CDATA[pulsating extruder?]]> I'm trying to calibrate my e3d and it seems to pulsate regularly, making patterned walls of varying thicknesses.  I also recently did a PSU upgrade and firmware update.  I don't see this problem in various print troubleshooting websites.  See picture:

http://i.imgur.com/0bWooLu.jpg

]]> https://www.soliforum.com/user/211/ 2016-02-06T08:25:40Z https://www.soliforum.com/post/115966/#p115966