Simplify3D User Forum

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!

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.

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

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

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

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

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?

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%)

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.

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