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RedDawg
(@reddawg)
Reputable Member
Top layer Moonscape

First time experiencing this issue, no idea what's going on. Any ideas? Printing this shredder at 200% using the provided .3MF files (with slight modifications/preferences.) Everything looks good EXCEPT for the end panels which have some weirdness going on in the top-most layers. Pictured is the second attempt WITH top surface ironing enabled. First attempt (without ironing) was even worse. Pretty sure it's not damp filament as much of the surface is perfect. Several hours into the third attempt and all looks fine (infill pattern, etc.), will probably not be home to observe the final layer(s) being layed down. If it turns out the same, I can probably sand down the ridges acceptably, but seriously, WTF?

This topic was modified 2 months ago by RedDawg

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Posted : 02/12/2022 5:16 pm
Diem
 Diem
(@diem)
Famed Member

That .3mf contains no metadata so you are using whatever print settings and profiles you happen to have left on your machine from the previous print.

Are you using a high density of fill?  These artifacts often show up close to 100% if the extrusion rate is not optimal.  They sometimes occur when a flat part is warping off the bed or is overcooled.

Cheerio,

Posted : 03/12/2022 4:11 am
fuchsr
(@fuchsr)
Famed Member
RE: Top layer Moonscape

Looks like related to infill and number of top layers. I'd increase the number of top layers and play with infill type and density.  

Posted : 03/12/2022 2:09 pm
RedDawg
(@reddawg)
Reputable Member
Topic starter answered:
RE: Top layer Moonscape

The infill (40%) is perfect up until the (four) top layers start to lay down. I was able to watch and the bead just seems to not adhere, but only in specific, but seemingly random areas. Up until this started, I had been printing at 150% speed. As the problem developed I dropped it back to 100% but the problem persisted. I also checked the belt tension, but it's spot on. The "direction" of movement of the nozzle makes no difference. As it printed these last layers, I used a broad, flat tip on a soldering gun to "force" the ridges down (a sort of manual ironing. The final ironing pass of the nozzle made a more acceptable final result, but it is still noticeable. Still looking for a reason and solution.

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Posted : 03/12/2022 4:13 pm
fuchsr
(@fuchsr)
Famed Member
RE: Top layer Moonscape

For a large flat surface four layers at 0.2mm layer height feels low to me. I usually have at least 5 or 6. 

Posted : 03/12/2022 4:16 pm
RedDawg
(@reddawg)
Reputable Member
Topic starter answered:
RE: Top layer Moonscape

Each layer added its own ridges, it would have been even worse.

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Posted : 03/12/2022 4:19 pm
fuchsr
(@fuchsr)
Famed Member
RE: Top layer Moonscape

What's your infill pattern?

Posted : 03/12/2022 4:51 pm
RedDawg
(@reddawg)
Reputable Member
Topic starter answered:
RE: Top layer Moonscape

Gyroid, but I can't see how the pattern makes any difference. I've used that pattern on numerous other prints without having that issue. The last infill layer before the final four top layers looked perfectly formed. The ridges seem to form randomly, i.e., not in the same locations or with the same precise shape in each of the three prints, although there is obviously some linear pattern in their structure. This last picture is of the next-to-last layer in progress. Still mystified. 

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Posted : 04/12/2022 1:22 am
RedDawg
(@reddawg)
Reputable Member
Topic starter answered:
RE: Top layer Moonscape

Once I loaded the .3MF I modified several settings, so they were not "leftover" from a previous print. IIRC, the infill was 30%.

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Posted : 05/12/2022 4:31 am
RedDawg
(@reddawg)
Reputable Member
Topic starter answered:
RE: Top layer Moonscape

I see I have posted two different percentages for the infill. I may have tried both during the three trials, but it would not have been more than 40% in any case.

Hear ye, Hear ye! Step right up folks and get your Government salvation here! Less than $.002 per word! Amazon.com/dp/B0B8XMMFP4

Posted : 05/12/2022 2:38 pm
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