1 Topic by morty

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Topic: Overhang quality

Hi,
I have been having a little trouble with anything that requires support or has overhang.  I've tried to slow down the speed by approximately 20% and I get the same result. I'm printing PLA at .2mm with 2 perimeters (tried increasing these as well). I also remember having this issue with ABS so I don't think it is due to lack of cooling on the PLA. Does anyone have any ideas? The inside of the prints are good as shown in the pictures. Just not the overhangs on the outsides of the parts and where the support used to be. Any help would be greatly appreciated. Thanks!

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2 Reply by n2ri

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Re: Overhang quality

check slicer settings looks like a lack of infill for 1.

then try printing the test cube for flow calibration on thingaverse or in related topics here there are stl links

Solidoodle 2 with Deluxe kit cover & glass bed with heater. and 2nd board SD2 used not 3rd and alum platform not installed yet still wood. also need cooling fan installed to board. use Repetier Host couple vers. Slic3r also have all free ware STL programs

3 Reply by morty

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Re: Overhang quality

Thanks for the reply. Flow rate seems to be ok. I've done all the calibrations and wall thickness tests. It prints great when there is no overhang.

4 Reply by wardjr

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Re: Overhang quality

In the first picture did it print in that orientation or did it print upside down and that is all bridged in the middle?

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5 Reply by morty

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Re: Overhang quality

Yes, sorry. I should have explained it better. In the first picture (unnamed-1.jpg), the part is upside down from how it printed and the exposed side (between the two humps) is where the support used to be. In other words, the ends curved up towards the ceiling which is what is what I need help with. So unnamed-3 is a birds-eye view of how it actually printed. The larger part shown in unnamed.jpg is also upside down as to how it printed. Unnamed-5.jpg is the birds-eye view of original print orientation of that part. Sorry for the confusion. I should have done a better job labeling and taking pictures. I just wanted to show the inside of the part with the birds-eye view to show that it was printing ok before and after the overhang. Please let me know if it's still confusing and I will take better pictures. Thanks.

6 Reply by morty

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Re: Overhang quality

Just to be clear, I took a profile picture of the first part in the correct print orientation to end any confusion. Thanks.

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7 Reply by wardjr

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Re: Overhang quality

It seems, amongst other things your biggest issue is poor extrusion.  You may have a partial clog or bad filament.  It also could be a calibration issue or something mechanical like backlash.
Your description was perfect and that was my assumption, just wanted to make sure.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website

8 Reply by morty

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Re: Overhang quality

I'm trying to figure out this quality problem through settings and the tests are pretty good. It seems that depending on the part, I have to adjust the speed of various parameters which is kind of a pain. Does anyone else have this issue? Again,this is PLA with an E3D v5. Basically things are looking better except for one thing. Is this a backlash problem pictured below? I have made most modifications on my SD3 except for addressing Z backlash. Any thoughts? Thanks!

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9 Reply by wardjr

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Re: Overhang quality

Try using random start points in your profile.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website

10 Reply by morty

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Re: Overhang quality

Thanks Wardjr. I selected Seam Position: Random and I think that is better but there's definitely something else still going on. In the picture below, it almost looks like it gets better the lower the bed gets. I'm going to clean off the z rod and maybe grease it up a bit. Would you might have another suggestion? Any help is greatly appreciated.

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