eileen.b
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Consistently skipping during last layer

Jul 13, 2018 11:20 pm

Printing cookie cutters and on the last section of the build it is skipping at certain points of the build. It has done so in the same exact spaces 3 times in a row. I went back into fusion360 and saved 2 new files. One the handle of the cutter only, which printed fine. The other was just the last layer, the cutter of the cookie cutter, which printed defective with the same missing parts as in the print of the full cutter (pictures attached) The cutter layer is 2mm higher than the next and supposed to be .6mm thick. I'm not sure if this is a printer problem or a software problem. All previews of the cookie cutter in fusion360 and Slic3r for Prusa show no defects.
Attachments
IMG_4316.jpg
IMG_4316.jpg (1.73 MiB) Viewed 100 times
IMG_4315.jpg
IMG_4315.jpg (1.9 MiB) Viewed 100 times
IMG_4313.jpg
IMG_4313.jpg (1.94 MiB) Viewed 100 times

Best Answer by joan.t » Jul 14, 2018 11:45 am
Hi Eileen

your model is designed with some very thin sections at the cutting edge and the shoulders between the bat's cheeks and it's wings

additionally you have scaled the model down, so the thin parts get even thinner :(

so the Slicer doesn't place any filament where the section is too thin.
Cookie.JPG
in the top picture, you can see two spikes
Cookie2.jpg
these are caused because the two lines come together in the pointed areas circled in the second picture.
20180714_121353[1].jpg
in the third picture you can just about see the two spikes in reality. where I test printed the model...

it's not the best print, I set it going, using the dregs of a reel of filament at 200% speed, to print quickly, then forgot to slow it down for the top part... but it clearly shows that the thin edge section and the shoulder parts didn't get realised because they are too thin

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joan.t
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Re: Consistently skipping during last layer

Jul 13, 2018 11:31 pm

Hi Eileen,
can you ZIP the STL and attach a copy for us to try?

regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

eileen.b
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Re: Consistently skipping during last layer

Jul 14, 2018 1:31 am

I've attached the SVG and the gcodes also.
Attachments
2.5 inch Halloween Bat (2mm cutter only) (2).zip
gcode
(4.93 KiB) Downloaded 2 times
2.5 inch Halloween Bat (2).zip
gcode
(1.2 MiB) Downloaded 2 times
Halloween Bat Svg.zip
SVG
(20.49 KiB) Downloaded 2 times

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joan.t
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Re: Consistently skipping during last layer

Jul 14, 2018 2:04 am

Hi Eileen

I am having difficulty understanding what you are showing me...

the cutter only g code file seems to just have two prongs in it.
the other G code file seems to have a cookie cutter with a holding flange at the bottom, and two prongs at the top
Cookie.JPG
Cookie.JPG (32.82 KiB) Viewed 95 times
if the prongs weren't there I expect the file would print...

how did you generate the G code?
I suspect you had a surface tessalation file (STL) which you loaded in to Slic3r


is there any chance of sending that STL file? in an attachment?
regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

eileen.b
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Joined: May 20, 2018 4:01 am
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Re: Consistently skipping during last layer

Jul 14, 2018 6:34 am

My apologies Joan, I sent the SVG instead. I've attached the STL, it was made in Fusion 360. I got the gcode from Slic3r Prusa Edition.
Attachments
halloween bat stl.zip
(157.6 KiB) Downloaded 2 times

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joan.t
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Re: Consistently skipping during last layer

Jul 14, 2018 11:45 am

Hi Eileen

your model is designed with some very thin sections at the cutting edge and the shoulders between the bat's cheeks and it's wings

additionally you have scaled the model down, so the thin parts get even thinner :(

so the Slicer doesn't place any filament where the section is too thin.
Cookie.JPG
Cookie.JPG (32.82 KiB) Viewed 78 times
in the top picture, you can see two spikes
Cookie2.jpg
Cookie2.jpg (88.42 KiB) Viewed 78 times
these are caused because the two lines come together in the pointed areas circled in the second picture.
20180714_121353[1].jpg
20180714_121353[1].jpg (1.17 MiB) Viewed 78 times
in the third picture you can just about see the two spikes in reality. where I test printed the model...

it's not the best print, I set it going, using the dregs of a reel of filament at 200% speed, to print quickly, then forgot to slow it down for the top part... but it clearly shows that the thin edge section and the shoulder parts didn't get realised because they are too thin
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

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joan.t
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Re: Consistently skipping during last layer

Jul 14, 2018 1:29 pm

Hi Eileen,

I trimmed the thin edge off the model, and extended the thicker part to the same height as the original, re scaled and re sliced the model and as you see it came out good.
20180714_142319[1].jpg
20180714_142319[1].jpg (1.78 MiB) Viewed 74 times
regards Joan
Attachments
cookie1.zip
(573.97 KiB) Downloaded 1 time
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

eileen.b
Posts: 4
Joined: May 20, 2018 4:01 am
Contact: Send private message

Re: Consistently skipping during last layer

Jul 23, 2018 4:54 am

Hi Joan,
Your last few replies have greatly helped! I reconfigured my measurements in the designing process and i was able to print a cookie cutter successfully!! My problem has been solved! Thank you very much for your help. My only lasting question is that if i have a .4mm nozzle should i be able to print something that is .4mm and the same with a .25mm nozzle?

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PJR
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Re: Consistently skipping during last layer

Jul 23, 2018 7:49 am

eileen.b wrote:
Jul 23, 2018 4:54 am
My only lasting question is that if i have a .4mm nozzle should i be able to print something that is .4mm and the same with a .25mm nozzle?
In theory, yes but in practice, you will very often find that such "thin walls" are very weak and delaminate easily. Ideally you do need to print about 25% wider than the nozzle to get good layer adhesion on single-wall models.

You will also find that different slicers handle things differently.

Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage or loss.

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