flow rate gone to the dogs...!!! my z artifacts have gone from near perfect from the object on the left to the object on the right.. I know it is some kind of flow rate issue but cant seem to figure it out ... checked the extruder steps twice... checked the pid tuning of the hotend... but cant seem to get it ... The only thing i changed was the linear bearing on the z axis and the extruder main gear as it had snapped on the axis... the new gear is better than the old one.. any ideas??? the hot end is a j-head with a 0.4 mm nozzle and the print is done at 0.25mm layer height... the printer is a mendelmax 1.5... the z axis threaded rods are m6 rods... and the z axis is set to 1/16 microstepping... qRN7pae.jpg mod_embed_images_loadimage('b02a28ca5b8b9473c1b33d2a7ac85e4f', '/forum/thumbcache/1ec/ecd/888/0e3/d71/fa0/f1d/e0b/f95/6a2/4f_800x400.png', 'http://imgur.com/qRN7pae.jpg', 'https://reprap.org/forum/addon.php?4,module=embed_images,check_scaling=1,url=http%3A%2F%2Fimgur.com%2FqRN7pae.jpg', '', 305448, 800, 400, 'Loading image ...', false); vnuGAYt.jpg mod_embed_images_loadimage('a9826e65c06f3da20a594f64b07cc84d', '/forum/thumbcache/588/857/0bb/7c4/a72/00f/f39/268/8fc/ad7/0b_800x400.png', 'http://imgur.com/vnuGAYt.jpg', 'https://reprap.org/forum/addon.php?4,module=embed_images,check_scaling=1,url=http%3A%2F%2Fimgur.com%2FvnuGAYt.jpg', '', 305448, 800, 400, 'Loading image ...', false); https://reprap.org/forum/read.php?4,305448,305448#msg-305448 Tue, 17 Mar 2026 08:13:58 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,305448,306013#msg-306013 Re: flow rate gone to the dogs...!!! https://reprap.org/forum/read.php?4,305448,306013#msg-306013
If the center hole on the gear is not "centered" this will turn in an oval. Making varied extrusions.

Also, trying to push the filament too fast. If your extruder motor has high enough torque, it won't skip. Causing the gear to turn and cut a groove in the filament loosing friction. Either turn your heat up, or turn your speed down might help.
On the same note. If your motor doesn't have the torque, it may skip steps. Causing inconsistent extruded lengths.]]> KingRahl Reprappers Tue, 04 Feb 2014 11:00:36 -0500 https://reprap.org/forum/read.php?4,305448,305811#msg-305811 Re: flow rate gone to the dogs...!!! https://reprap.org/forum/read.php?4,305448,305811#msg-305811
any ideas whats causing it...?? the motor driver is set to 1/8 steps and it is a generation 4 electronics motor driver... also checked if the filament is slipping and it is not...]]> ekaggrat Reprappers Tue, 04 Feb 2014 03:07:41 -0500 https://reprap.org/forum/read.php?4,305448,305791#msg-305791 Re: flow rate gone to the dogs...!!! https://reprap.org/forum/read.php?4,305448,305791#msg-305791 lazzymonk Reprappers Tue, 04 Feb 2014 02:16:55 -0500 https://reprap.org/forum/read.php?4,305448,305494#msg-305494 Re: flow rate gone to the dogs...!!! https://reprap.org/forum/read.php?4,305448,305494#msg-305494
thingiverse

so i doubt it is that .. also it is not so regular as z wobble]]> ekaggrat Reprappers Mon, 03 Feb 2014 13:31:40 -0500 https://reprap.org/forum/read.php?4,305448,305477#msg-305477 Re: flow rate gone to the dogs...!!! https://reprap.org/forum/read.php?4,305448,305477#msg-305477 cat.farmer Reprappers Mon, 03 Feb 2014 13:17:49 -0500 https://reprap.org/forum/read.php?4,305448,305448#msg-305448 flow rate gone to the dogs...!!! https://reprap.org/forum/read.php?4,305448,305448#msg-305448
any ideas???

the hot end is a j-head with a 0.4 mm nozzle and the print is done at 0.25mm layer height... the printer is a mendelmax 1.5... the z axis threaded rods are m6 rods... and the z axis is set to 1/16 microstepping...




]]> ekaggrat Reprappers Mon, 03 Feb 2014 12:50:37 -0500