Seeking advice on holes in top of print

[fredini]

Having problems with holes on the top of prints
Printing ABS set to 6 top layers, 16% infill and still getting holes on top:
Hole in head by fredini, on Flickr

Hole in head by fredini, on Flickr

Any Advice? Other than that the prints are perfect!

[KeyboardWarrior]

Can you post the factory file for this part?

To save a factory file, go to File-->"Save factory file as" when this part is imported and your slicing settings are configured.

[fredini]

Sure thing- the file is here:
https://www.dropbox.com/s/gmczfkd70pw0o ... y.zip?dl=0

[billyd]

Higher infill % or a thicker infill width might help this.

[jimc]

yes higher infill. you might have 6 top layers but at the center of the head it might not have anything to print on. make 2 processes and have the top 3-5mm switch to 30-40% infill

[JoeJ]

This tutorial shows how to change the infill for a different region: https://www.simplify3d.com/support/tuto ... f-a-model/

That way you can increase it just during the top 5mm of the print instead of making it denser for the entire print

[mvansomeren]

I could see this working with higher % infill at the bottom and lesser % near the top, but would it work well the other way around? I would think that you would have to gradually increase the % through many layers so that the denser infill doesn't fall through the less dense infill.

The OP needs the denser infill at the top. I wonder what % differences you can have without the first few layers of denser infill falling into the less dense areas?

[JoeJ]

It doesn't really "fall through". It's just like normal bridging. The plastic has no trouble bridging the small 10-20mm gaps that you are going to have between infill segments. It might sag a bit for the first few layers, but that's why you generally want to start this change at a z-height that is a few layers below where you really need it. By then it will be fine.

Give it a try and I think you will see. Doing dense infill on top works just fine as long as you have a reasonable infill percentage below (i.e. 10% and not 1%)

[fantome]

I've had success by increasing the number of infill angles. Instead of just -45 and +45 degrees I use a bunch of them, like 4 or more, 0, 45,-45,90. This will produce a smaller empty space between infill.

Hope this helps.

[katapault]

This problem almost made me contemplate suicide (just joking) but it was very frustrating. Have a look at this it was very helpful to me, the big change for me that sorted the problem was the extrusion multiplier, I bumped it up to 1.15 and the problem was solved. https://www.youtube.com/watch?v=NPEXGe1IPPE