SoliForum - 3D Printing Community — Top layer infill holes near perimeter

Re: Top layer infill holes near perimeter

2016-10-31T06:28:15Z

So I've bumped up my infill overlap to 30% in simplify 3d and my top layer is looking perfect. I do still have a circle problem though, even though I've aligned it as well as I can. I literally spent 5 minutes just running the y axis back and forth and making sore the back rod was staying in its place. I'm planning on doing Adrian's "solution to all circle problems" mod in the next couple of days so hopefully that will fix it

Re: Top layer infill holes near perimeter

2016-10-31T04:04:33Z

This is what I'm getting right now. I'll try it out with more perimeters and see what happens

Re: Top layer infill holes near perimeter

2016-10-31T03:50:13Z

Quintox303 wrote:

I've got my infill overlap at 15% at the moment. I don't think it's related to that as it's only on one edge that the infill doesn't meet the perimeter. I've also tried it with 2 rolls of filament now and it won't go away I don't think another slicer would do anything, I'm convinced it's a mechanical issue as the tool path looks perfect

I added to my post. You might measure your printed wall versus desired wall thickness. Try adding an additional perimeter or taking one away from your test.

Re: Top layer infill holes near perimeter

2016-10-31T03:35:03Z

I've got my infill overlap at 15% at the moment. I don't think it's related to that as it's only on one edge that the infill doesn't meet the perimeter. I've also tried it with 2 rolls of filament now and it won't go away I don't think another slicer would do anything, I'm convinced it's a mechanical issue as the tool path looks perfect

Re: Top layer infill holes near perimeter

2016-10-31T03:30:59Z

Have you tried playing with the infill overlap settings in your slicer. Mine by default are set at 12 percent. I believe this controls how far into the inner perimeter that the infill goes. Also have you tried a different filament. I had this issue once myself and it was bad filament. You could also try another host like Cura or others.

This can also be caused by bad math. Your wall thickness needs to be an even multiple of your nozzle width. If it is odd the slicer will cut the odd pass and leave gaps like this.

Each pass or perimeter that the extruder makes will always be your set extrusion width. The slicer will not make it thinner or wider unless you change it. So all verticle thicknesses in your print are based on multiples of that setting.

Re: Top layer infill holes near perimeter

2016-10-31T03:30:20Z

Re: Top layer infill holes near perimeter

2016-10-31T02:55:03Z

Well, after a couple of days of tinkering I still haven't been able to get rid of this problem. My belts are tight, all screws and pulleys are in tight, I've re aligned the y axis as well as I can, it seemed to be perfect but I havent printed a circle yet to test. Theres no slop in the extruder carriage either and the hot end is secured well. I'll upload a picture in about an hour of what sort of effect its having on the top surface still once this print has finished. Then ill start a circle to see how its going with the y alignment

Re: Top layer infill holes near perimeter

2016-10-25T23:53:56Z

if the belts are loose, that could be a big portion of your problem. they need to be fairly snug

Re: Top layer infill holes near perimeter

2016-10-25T12:07:05Z

Thats so much for your fast responses! I'll check over all those things tomorrow and hopefully that'll be the fix. I do know my belts aren't as tight as they could be, I've been meaning to tighten them. And I will also do another y axis circle calibration and make sure all my axes are running smoothly. I'll let you know how it goes

Re: Top layer infill holes near perimeter

2016-10-25T11:56:26Z

Looking at the print with circles, I would have to agree that there is something physically loose or out of alignment. Check everything over carefully - all screws/nuts are tight, belts snug, Y axis is aligned evenly on both sides, no slop in the extruder carriage/hotend.

FWIW - on a well calibrated printer, you should not need to use infill overlap.
I have that setting in Slic3r set to zero on my printers and have no problems with infill meeting perimeters.

Re: Top layer infill holes near perimeter

2016-10-25T11:49:51Z

Here is a link to someone else who had similar problems. Glasswalker had very good info on things to check on your printer. One of the things he mentioned is to make sure the rods are smooth and the carriage moves smoothly. Unfortunately, I don't have a cartesian printer. My printer is a delta printer and it can have a lot worse problems than cartesian if its not calibrated properly.

https://ultimaker.com/en/community/1386 … t-circular

More info:
https://groups.google.com/forum/#!topic … Nnym1MC94Y

Re: Top layer infill holes near perimeter

2016-10-25T11:42:00Z

Here is a link to a site that provides good troubleshooting information.

https://www.simplify3d.com/support/prin … nd-outline

Re: Top layer infill holes near perimeter

2016-10-25T11:34:29Z

Check your belts and gears to make sure its tight and not sloppy. You may have a backlash issue at a certain angle. You can bump up the overlap to 20% to see if it helps if the problem remains. However, there is something mechanically wrong with your printer.

Marlin has backlash compensation if you can't get rid of the problem mechanically. You can look up hysteresis correction as a last resort.

Top layer infill holes near perimeter

2016-10-25T10:15:56Z

Hey guys, wondering if any of you would be able to help me with this. I've been consistently getting these holes on the top surfaces of my prints where the inner perimeter meets the infill. Over/under extrusion can't be an issue, I've calibrated that perfectly. I also don't think speed is an issue as the top infill was printed at 30mm/s. Extrusion width is 0.48mm, 4 top solid layers at 0.2mm layer height. Infill was 30%, and infill/perimeter overlap was 15%. It didn't have any trouble making the solid top surface, just at the edges it doesn't connect to the perimeter in some parts. X/Y calibration seems perfect when measuring whole parts, but there is a gap between threads when printed at a certain angle as you can see in the letter picture.

All printed on my proudly owned heavily modified solidoodle 3

Dont worry about the roughness of the external perimeter on the cube, more single perimeters were printed above that but I cut them off for the picture.

Thanks for any help you'll be able to give