Spiral Vase gaps/jerking once per layer #2023

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traveltrousers opened this Issue May 8, 2014 · 7 comments

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@traveltrousers

I'm not sure if this is a reoccurrence of a previous bug since it looks very similar:
#1773

Tried a few curved objects and the gcode looks like this once per turn 👍
G1 X19.318 Y36.127 E0.00835 ; normal code
M204 S3000
G1 Z0.664 F12000.000
G1 X19.496 Y36.032 F12000.000
M204 S3000
G1 Z0.665 X19.437 Y36.346 E0.00864 F600.000 ; good code resumes

My acceleration is only 3000 on all 3 axis so its quadrupling it, jerking up and across and leaving a tiny, but noticeable, gap at approximately the same position...

vase

STL : https://www.dropbox.com/s/2h2djw90afefdge/sphtest8.stl

Windows 7
Tried in 1.0.1 and latest 1.1.2 Exp...

Great work Alex!!! :)

@traveltrousers

I also tried with the default settings on a 20x200mm tube and noticed something else, there is a gap of nearly a whole layer about 20mm up... I tried swapping settings to see if I could change things without success.

tube

@alexrj
Owner
alexrj commented May 12, 2014

@traveltrousers, there's no STL file at that link… can you fix it? Thank you!

@traveltrousers

Sorry about that, my dropbox was getting full so I dumped all my stls

📦

https://www.dropbox.com/s/xd56ftz8a3su7sm/sphtest8.stl

@alexrj
Owner
alexrj commented May 21, 2014

Downloaded, thank you. Will look into it asap.

@alexrj alexrj added this to the 1.1.3 milestone May 21, 2014
@alexrj
Owner
alexrj commented May 21, 2014

Very interesting issue. Basically it shows that layers don't necessarily have aligned vertices. Without this assumption, we should either spiralize the entire G-code stream instead of doing it layer-by-layer, or add aligned vertices.

@traveltrousers

I thought perhaps it was a problem/issue with the model or some other setting but if it happens on a simple tube there is something else going on. Incidentally Cura slices it perfectly so at least I've been able to continue prototyping my model....

@alexrj
Owner
alexrj commented May 22, 2014

Done! Thank you for the report.

@alexrj alexrj closed this May 22, 2014
@alexrj alexrj added the Done label May 22, 2014
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