Problem with top layer Hi guys, I own a prusa mendel i2. have to say it is printing quite nicely but have tried to make bridging work and was unsucessful. I also tied to print a wing for the 350mm glider and had problems with top layer. Print parameters: Nozle dia = 0.35mm Fillament = 3mm Hotend temp = 170 Bed temp = 50 Layer height = 0.1mm Botom solid layers = 2 Top solid layers = 3 Perimeters min = 2 Fill density = 0.25 Fill pattern = rectlinear Top/bottom pattern = concentric Speeds: Perimeters = 15mm/s Small/Ext perimeters = 10mm/s Infill = 20mm/s Solid infill = 20mm/s Top solid infill = 15mm/s What happens is that the top layer does not cover the infill, so I end up with small holes in the top layer. I use a 60mm fan with a custom fan mount blowing onto the print and hot end. Here is a picture of the wing and I colored the spot around the holes. I also use the latest wersion of slic3r with the detect bridging function so the fan is at 100% when covering the top. mod_embed_images_loadimage('c931f0c0de60c05a8fbdc9fb5605119c', 'https://reprap.org/forum/addon.php?151,module=embed_images,url=http%3A%2F%2Fimageshack.com%2Fi%2F5gkwk0j', 'http://imageshack.com/i/5gkwk0j', 'https://reprap.org/forum/addon.php?151,module=embed_images,check_scaling=1,url=http%3A%2F%2Fimageshack.com%2Fi%2F5gkwk0j', '', 272060, 800, 400, 'Loading image ...', false); Any ideas what to change or what im doing wrong? https://reprap.org/forum/read.php?151,272060,272060#msg-272060 Fri, 11 Sep 2026 10:35:29 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?151,272060,276365#msg-276365 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,276365#msg-276365 uncle_bob General Mendel Topics Thu, 05 Dec 2013 19:12:20 -0500 https://reprap.org/forum/read.php?151,272060,276273#msg-276273 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,276273#msg-276273
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uncel_bob
Unless you have a nozzle diameter below 0.2 mm, a 0.1 mm layer height simply isn't going to work for extrusion. It would only work with that nozzle if your bed is level to about 0.01 mm (and thus flat to better than 0.01 mm). Even with auto bed leveling and a fancy bed those numbers will be very hard to hit.

taking paper or wood as print ground 0.05mm layerheigth is working with a 0.5mm diameter nozzel on my mendel.]]> mekmekmek General Mendel Topics Thu, 05 Dec 2013 14:29:35 -0500 https://reprap.org/forum/read.php?151,272060,276253#msg-276253 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,276253#msg-276253
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Unless you have a nozzle diameter below 0.2 mm, a 0.1 mm layer height simply isn't going to work for extrusion. It would only work with that nozzle if your bed is level to about 0.01 mm (and thus flat to better than 0.01 mm). Even with auto bed leveling and a fancy bed those numbers will be very hard to hit.]]> uncle_bob General Mendel Topics Thu, 05 Dec 2013 13:21:49 -0500 https://reprap.org/forum/read.php?151,272060,276215#msg-276215 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,276215#msg-276215
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tadejv
So in my case i do bottom 2 layers each 0.1mm high, and on top I do 3 layers each 0.1mm

I think this is your issue. With just 3 layers at 100 microns, I don't think you're going to get the coverage you want. What happens if you go with 7 or ten layers at this layer height?]]> Karmavore General Mendel Topics Thu, 05 Dec 2013 11:59:49 -0500 https://reprap.org/forum/read.php?151,272060,275811#msg-275811 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,275811#msg-275811 but you can also print two sigle walled circels with are spaced to have the printer retract between them (turn off any random settings for this. for example jitter) then you will be able to see where the extruding fails. i bet he restart to week having not the grip he needs on the filament at 200mm/s.]]> mekmekmek General Mendel Topics Wed, 04 Dec 2013 13:22:46 -0500 https://reprap.org/forum/read.php?151,272060,275669#msg-275669 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,275669#msg-275669 I used to retract 4mm@200mm/s
The prints are better when retracting 1mm@40mm/s.
Any idea why?]]> tadejv General Mendel Topics Wed, 04 Dec 2013 06:11:01 -0500 https://reprap.org/forum/read.php?151,272060,273185#msg-273185 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,273185#msg-273185
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uncle_bob
When I set a 4 or a in Slic3r for top and bottom layers with a 0.3mm layer height, it prints 4 layers of 0.3 mm. It does not print twelve layers. It may do something completely different when it sees a 0.x number in that field.

Tried it, you cannot enter anything else than a whole nuber.]]> tadejv General Mendel Topics Thu, 28 Nov 2013 02:00:18 -0500 https://reprap.org/forum/read.php?151,272060,273038#msg-273038 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,273038#msg-273038 uncle_bob General Mendel Topics Wed, 27 Nov 2013 22:04:10 -0500 https://reprap.org/forum/read.php?151,272060,273024#msg-273024 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,273024#msg-273024
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tadejv
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JNZ
Because your "Nozle dia = 0.35mm", you have to change "Botom solid layers = 2 Top solid layers = 3", you should add a point in front of digit, should be 0.2 and 0.3.

Just try it, good luck:)


Hi, are you shure this will work?
As far I know the top/botom layer nuber is the nuber of layers.
So in my case i do bottom 2 layers each 0.1mm high, and on top I do 3 layers each 0.1mm

I am not sure, just in my experience, i think you can adjust the top layer to 0.3 or 0.5mm. Just my personal experience:)]]> JNZ General Mendel Topics Wed, 27 Nov 2013 21:22:15 -0500 https://reprap.org/forum/read.php?151,272060,272757#msg-272757 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,272757#msg-272757 uncle_bob General Mendel Topics Wed, 27 Nov 2013 11:02:49 -0500 https://reprap.org/forum/read.php?151,272060,272700#msg-272700 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,272700#msg-272700
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uncle_bob
Which of the "latest versions" of Slic3r are you using. They have 0.9.10b out as released code and 1.0.0rc1 as more or less beta. At least on my printer, 0.9.10b had top layer issues that were fixed in 1.0.0rc1

Hi bob,
yes I'm using 1.0.0rc1 build, and the difference as far I could see is that the new version detects bridging and enables the fan at 100% for the first top solid layer.
Wich kinda brings me to conclusion that I have innsuficient cooling.]]> tadejv General Mendel Topics Wed, 27 Nov 2013 10:02:01 -0500 https://reprap.org/forum/read.php?151,272060,272696#msg-272696 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,272696#msg-272696
Quote
JNZ
Because your "Nozle dia = 0.35mm", you have to change "Botom solid layers = 2 Top solid layers = 3", you should add a point in front of digit, should be 0.2 and 0.3.

Just try it, good luck:)


Hi, are you shure this will work?
As far I know the top/botom layer nuber is the nuber of layers.
So in my case i do bottom 2 layers each 0.1mm high, and on top I do 3 layers each 0.1mm]]> tadejv General Mendel Topics Wed, 27 Nov 2013 09:58:08 -0500 https://reprap.org/forum/read.php?151,272060,272654#msg-272654 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,272654#msg-272654 uncle_bob General Mendel Topics Wed, 27 Nov 2013 08:28:45 -0500 https://reprap.org/forum/read.php?151,272060,272563#msg-272563 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,272563#msg-272563
Just try it, good luck:)]]> JNZ General Mendel Topics Wed, 27 Nov 2013 04:10:12 -0500 https://reprap.org/forum/read.php?151,272060,272559#msg-272559 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,272559#msg-272559 JNZ General Mendel Topics Wed, 27 Nov 2013 04:04:49 -0500 https://reprap.org/forum/read.php?151,272060,272290#msg-272290 Re: Problem with top layer https://reprap.org/forum/read.php?151,272060,272290#msg-272290 uncle_bob General Mendel Topics Tue, 26 Nov 2013 13:36:27 -0500 https://reprap.org/forum/read.php?151,272060,272060#msg-272060 Problem with top layer https://reprap.org/forum/read.php?151,272060,272060#msg-272060 have to say it is printing quite nicely but have tried to make bridging work and was unsucessful.
I also tied to print a wing for the 350mm glider and had problems with top layer.

Print parameters:
Nozle dia = 0.35mm
Fillament = 3mm
Hotend temp = 170
Bed temp = 50
Layer height = 0.1mm
Botom solid layers = 2
Top solid layers = 3
Perimeters min = 2
Fill density = 0.25
Fill pattern = rectlinear
Top/bottom pattern = concentric

Speeds:
Perimeters = 15mm/s
Small/Ext perimeters = 10mm/s
Infill = 20mm/s
Solid infill = 20mm/s
Top solid infill = 15mm/s

What happens is that the top layer does not cover the infill, so I end up with small holes in the top layer.
I use a 60mm fan with a custom fan mount blowing onto the print and hot end.
Here is a picture of the wing and I colored the spot around the holes.
I also use the latest wersion of slic3r with the detect bridging function so the fan is at 100% when covering the top.



Any ideas what to change or what im doing wrong?
]]> tadejv General Mendel Topics Tue, 26 Nov 2013 02:51:46 -0500