SoliForum - 3D Printing Community — Rounded Top Issue

Re: Rounded Top Issue

null@example.com (Quintox303) — Thu, 19 Feb 2015 20:02:53 +0000

Thanks mdr and sheilds for your help. Just so you know, I was printing at the default slic3r speeds.

Anyway to I decided to get kisslicer set up and try it out, all with the same settings, and the difference was amazing. The tops were completely filled and the print looked great.

Sheilds, changing the temperature might work but you can't always be there to know when your print is just about to finish.

So I'll go back into slic3r and bump up my extrusion multiplier a bit and see how that goes.

I attached the picture of the kisslicer print below.

Many thanks,
Matt

Re: Rounded Top Issue

null@example.com (mdrVB6) — Thu, 19 Feb 2015 17:35:53 +0000

Quintox303 wrote:

I don't want to mess with the extrusion multiplier because I know that its properly calibrated.

How do you know? Have you performed the single wall cube test? Calibration is a fickle thing. Personally, I can pass a single wall width check and still be underextruding on solid layers, so I have bumped up the multiplier and my prints look far better, with all lines meeting.

You also never responded to my suggestion of slowing your speeds, did you try that?

Re: Rounded Top Issue

null@example.com (shields1.as) — Thu, 19 Feb 2015 17:35:15 +0000

when you get to the last 6 layers on the print try playing with the extrusion heat manually. Try cranking it up 5 C and then do a print where on the last 6 layers you crank it down 5 C and see with that does. I do this on some of my small prints

Quintox303 wrote:

So here are the pictures of what happened when I changed the thread width from 0.42 to 0.48. The left one in the picture is 0.42 and the right is 0.48. The overall print quality looks about the same but the top part wasn't fixed. At actually looks a bit worse on the 0.48 model.
I've looked around the net but can't seem to find anyone else with this problem. I don't want to mess with the extrusion multiplier because I know that its properly calibrated. What could it be that is causing this problem?

Re: Rounded Top Issue

null@example.com (Quintox303) — Thu, 19 Feb 2015 09:33:56 +0000

So here are the pictures of what happened when I changed the thread width from 0.42 to 0.48. The left one in the picture is 0.42 and the right is 0.48. The overall print quality looks about the same but the top part wasn't fixed. At actually looks a bit worse on the 0.48 model.
I've looked around the net but can't seem to find anyone else with this problem. I don't want to mess with the extrusion multiplier because I know that its properly calibrated. What could it be that is causing this problem?

Re: Rounded Top Issue

null@example.com (Quintox303) — Thu, 19 Feb 2015 07:29:02 +0000

Ok so I'm recalibrating to make my extrusion width 0.48mm instead of 0.42 which is what it was earlier and I'll post the results later.

Re: Rounded Top Issue

null@example.com (DePartedPrinter) — Tue, 03 Feb 2015 16:00:48 +0000

Quintox303 wrote:

I'll re-calibrate my e steps/mm and flow rate and see how I go with some more tests. I think it might be the speed for the top layers though. I think I had it going at about 80.

Did you try increasing your extrusion multiplier?

Re: Rounded Top Issue

null@example.com (Quintox303) — Mon, 02 Feb 2015 21:15:46 +0000

I'll re-calibrate my e steps/mm and flow rate and see how I go with some more tests. I think it might be the speed for the top layers though. I think I had it going at about 80.

Re: Rounded Top Issue

null@example.com (DePartedPrinter) — Mon, 02 Feb 2015 19:38:23 +0000

increase your extrusion multiplier by .03 until the problem goes away.

Re: Rounded Top Issue

null@example.com (mdrVB6) — Mon, 02 Feb 2015 13:23:12 +0000

Could be under extrusion, run a single wall cube test and let us know how it goes.

Also, maybe try decreasing your solid layer and top solid layer speed. I've noticed when I go too fast it does not really have as much time for the flat part of the nozzle to really press down into the plastic and make it nice and flat, so you end up with thinner lines than if you had gone slower.

Maybe also try an STL with more faces too.

Re: Rounded Top Issue

null@example.com (redbarret) — Mon, 02 Feb 2015 09:00:50 +0000

First image looks like underextrusion.
Second one underextrusion, or delamination and/or backlash.

But I think if Slic3r would put shells for parts which are visible from top or bottom (outer surface) as well regardless of perimeter count it would greatly improve visual appearance.
I mean these parts:

Of course you can increase the perimeter count, but that greatly increases print time.
Anyone else noticed that?

Rounded Top Issue

null@example.com (Quintox303) — Mon, 02 Feb 2015 07:12:18 +0000

This seems to be a recurring issue for all of my prints with round tops. When the circles start getting smaller and smaller, my printer leaves holes in the top. I don't know if this is an issue that can be solved by increasing the thickness of my shell or not. I couldn't find anything else about this on the internet so I'm hoping I can get some help here.

Does anyone know how to fix this?