Shells not bonding

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cdavignon
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Joined: Sun Feb 10, 2019 7:39 pm

Shells not bonding

Postby cdavignon » Sun Feb 10, 2019 7:51 pm

Hi all. I am using ideamaker with an ender 3 pro .4 nozzle, .48 ext width. I have calibrated the machines e steps and done a calibration of the filament flow. The problem im having is that my shells are not connecting and have gaps between the straight runs. The corners seem to be fine. any thoughts or suggestions?

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Vicky@Raise3D
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Joined: Fri Mar 25, 2016 3:54 am

Re: Shells not bonding

Postby Vicky@Raise3D » Tue Feb 12, 2019 2:01 am

Would you like to share the pictures of the top and bottom surfaces with us?

cdavignon
Posts: 7
Joined: Sun Feb 10, 2019 7:39 pm

Re: Shells not bonding

Postby cdavignon » Tue Feb 19, 2019 9:51 pm

Hi Vicky,
I figured out my issue with the shells not bonding. I was under extruding. I thought the slicer would adjust the filament flow for different speeds but i figured out you need to set the filament flow rate for each speed in the template settings. After i figured out what i needed to set my filament flow for each speed in the template settings my shell bonding issue went away. The problem i am having now is that small cylinders are being under extruded, even though i am using the same speed and flow rate I am using for other structures like the outer shell. I have found if i manually increase the filament flow rate in the printer menu from 92.2%, which is what i set it to in idea maker, to 100% the small cylinder will start extruding properly. Any thoughts on why everything would extrude properly except for small cylinders?

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Vicky@Raise3D
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Joined: Fri Mar 25, 2016 3:54 am

Re: Shells not bonding

Postby Vicky@Raise3D » Thu Feb 21, 2019 2:24 am

The flowrate you have changed is the overall flowrate for all structures.
If you didn't find any obvious over-extrusion issue on other structures, you can use this flowrate for this filament based on your result.

cdavignon
Posts: 7
Joined: Sun Feb 10, 2019 7:39 pm

Re: Shells not bonding

Postby cdavignon » Thu Feb 21, 2019 2:37 am

At the lower 92.2% flow rate I can run at a 25mm/s speed for my shells and I get perfect shell bonding, less noticeable seams, sharper corners, and a dimensionally accurate model. At the higher 100% flow rate I get just the oposite. I also have to increase my speed when flowing at the higher rate to remain dimensionally accurate.

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Vicky@Raise3D
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Re: Shells not bonding

Postby Vicky@Raise3D » Thu Feb 21, 2019 7:14 pm

May I ask some pictures can show the difference of your print result?

cdavignon
Posts: 7
Joined: Sun Feb 10, 2019 7:39 pm

Re: Shells not bonding

Postby cdavignon » Thu Feb 21, 2019 8:54 pm

The only difference in these 3 prints is the filament flow rate. I allowed the first two to print as far as they would go. As you can see there is a huge difference between 99% and 100%. I feel like a difference that big has to be a glitch in the slicer, right?
Attachments
IMG_4632.jpg

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Vicky@Raise3D
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Joined: Fri Mar 25, 2016 3:54 am

Re: Shells not bonding

Postby Vicky@Raise3D » Sat Feb 23, 2019 12:51 am

Would you like to share the gcode files and data files of all three try with me? Want to dig in to see whether it is caused by any other settings.

cdavignon
Posts: 7
Joined: Sun Feb 10, 2019 7:39 pm

Re: Shells not bonding

Postby cdavignon » Sat Feb 23, 2019 2:02 am

Sure, no problem. I saved them as a zip file with sub folders labeled 92%,99%, and 100%.
Attachments
Stringing Test Gcode.zip
(1.02 MiB) Downloaded 10 times

cdavignon
Posts: 7
Joined: Sun Feb 10, 2019 7:39 pm

Re: Shells not bonding

Postby cdavignon » Sat Feb 23, 2019 4:28 am

Vicky I believe I have found other instances of this same issue here:

https://www.reddit.com/r/3Dprinting/com ... s_failing/

https://www.google.com/amp/s/amp.reddit ... ideamaker/

In the second link, he is using the same 3d printer as I am, an ender 3. They both mention the prints failing until changing the filament flow to 100%.

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Vicky@Raise3D
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Joined: Fri Mar 25, 2016 3:54 am

Re: Shells not bonding

Postby Vicky@Raise3D » Thu Feb 28, 2019 1:35 am

Sorry, but we don't have Ender3 on hand to test. But we guess it might be something related to retraction settings.
Try changed retraction amount to 5mm and retraction and restart speed to be 40mm/s and see whether it helps.


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