Strange arms initial movement

Tincho85 · Post by **Tincho85** » Mon Jun 29, 2015 12:06 am

Hi guys, please I need some help here. This problem has been troubling me since I switched to CuraEngine.
When the print starts, the movement of the arms till they reach the printing area stops 2 times.

At first I thught it was a belt tension issue, but no, this only happens when using CuraEngine, not with Slic3r.

Here is a video of the problem in question:
[youtube]http://www.youtube.com/watch?v=LGb9PChLzwA[/youtube]

I've tried:
less speed.
different g-code starts.
different 3d models to print.

Here are both G-codes, maybe someone can see something wrong.
CuraEngine start G-code generated for a 20x20x10 cube:

Spoiler:

Slic3r start G-code generated for a 20x20x10 cube:

Spoiler:

teoman · Post by **teoman** » Mon Jun 29, 2015 9:38 am

M'y Printer has always donde this.

But the stop stare not so pronounced.

It Seems almost as if the lowering was divided in to three phases. But then you would expect the final phase to be slower.

JFettig · Post by **JFettig** » Mon Jun 29, 2015 10:48 am

Mine did that when slicing with matter control, but never has with S3D. I do get other weird behaviors when I run my calibration script - it accelerates twice on a simple straight medium-speed move.

Polygonhell · Post by **Polygonhell** » Mon Jun 29, 2015 1:48 pm

They all do it, it's an issue in the firmware, that is triggered by very long linear moves, so Slicer can be a contributor, basically AFAICS the code that breaks the move into parts for the delta calculation has a very small buffer and it ends up getting starved/can't keep up with the motion.

bvandiepenbos · Post by **bvandiepenbos** » Mon Jun 29, 2015 2:06 pm

I have seen the same thing.
Never has caused any issues that I am aware of.

Tincho85 · Post by **Tincho85** » Mon Jun 29, 2015 3:44 pm

Thanks for your feedback!
So it's normal, one less thing to worry about

Welcome to the SeeMeCNC Community

Strange arms initial movement

Strange arms initial movement

Re: Strange arms initial movement

Re: Strange arms initial movement

Re: Strange arms initial movement

Re: Strange arms initial movement

Re: Strange arms initial movement