Hello everyone, not quite sure how to describe what I'm seeing, so I'm including some pictures I just recently got a Mendel 3, and finished putting it together this weekend. Everything seemed to be going ok, at least for the calibration parts, and i tried printing the coat hook. Everything seemed to be ok. But then today I tried printing a couple of round parts, and I seem to have hit an issue. My printer seems to "pulse" as it's going around a curve. There is a very small pattern of excess filament followed by thin filament. Has anyone seen this before? I'm guessing that because it's very consistent in how the irregularities are laid out it's not something physical. I've tried printing several different items, all with the same result. Here are some versions: firmware version 1.09 slic3r version 1.1.7 This is what the skirt looked like. Clear view of the "pulsing". This is three rounds of skirt [attachment 55448 DSC_0790.JPG] This is what a round piece looks like. Almost like gear teeth on the perimeter. [attachment 55359 DSC_0791.JPG] https://reprap.org/forum/read.php?151,513564,513564#msg-513564 Sat, 17 Oct 2026 02:55:48 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?151,513564,519261#msg-519261 https://reprap.org/forum/read.php?151,513564,519261#msg-519261
It's because you're printing directly from Pronterface, but using the wrong settings. Use the 'ormerod.cmd' start script; the mendel.sh is actually for our old version of the Mendel, using Melzi electronics. The way the Melzi and the Duet communicate is different (it's the serial flow control, I think), so the Duet ends up stuttering as you send the gcode. If you use the 'ormerod.cmd', flow control is set correctly, and it will print smoothly. Ideally, print from the SD card - it's more reliable; your printer won't stop when you accidentally disconnect the USB, or your computer goes to sleep!

I need to update the 'software' folder; it is using quite an old version of Slic3r, and the startup scripts need updating, and correctly naming.

Ian
RepRapPro tech support]]> droftarts General Mendel Topics Tue, 09 Jun 2015 04:52:50 -0400 https://reprap.org/forum/read.php?151,513564,514204#msg-514204 https://reprap.org/forum/read.php?151,513564,514204#msg-514204 the_digital_dentist General Mendel Topics Wed, 27 May 2015 07:19:47 -0400 https://reprap.org/forum/read.php?151,513564,514099#msg-514099 https://reprap.org/forum/read.php?151,513564,514099#msg-514099 slackcub General Mendel Topics Wed, 27 May 2015 02:01:09 -0400 https://reprap.org/forum/read.php?151,513564,513564#msg-513564 https://reprap.org/forum/read.php?151,513564,513564#msg-513564
I just recently got a Mendel 3, and finished putting it together this weekend. Everything seemed to be going ok, at least for the calibration parts, and i tried printing the coat hook. Everything seemed to be ok. But then today I tried printing a couple of round parts, and I seem to have hit an issue.

My printer seems to "pulse" as it's going around a curve. There is a very small pattern of excess filament followed by thin filament. Has anyone seen this before? I'm guessing that because it's very consistent in how the irregularities are laid out it's not something physical.

I've tried printing several different items, all with the same result.

Here are some versions:

firmware version 1.09
slic3r version 1.1.7

This is what the skirt looked like. Clear view of the "pulsing". This is three rounds of skirt

[attachment 55448 DSC_0790.JPG]

This is what a round piece looks like. Almost like gear teeth on the perimeter.
[attachment 55359 DSC_0791.JPG]]]> slackcub General Mendel Topics Mon, 25 May 2015 23:44:19 -0400