[Infill showing through walls]

2 hours ago, yellowshark said:

Wow @lakerice, 2 days + you are brave😃. Yes your latest print looks much better and your legs look better than mine, I must get to the bottom of these zits although that will have to wait as I have a job agreed today that I need to deliver on Tuesday. My print that you are looking at was done with the model scaled down 50%. It is a bit late in the day now but you know it is always worth scaling down a model or sinking it into the bed (-Z position) just to print a portion of the model, to make sure the settings are right before pursuing a large print of 1-2 days.

 

 

I note your response to @geert_2 where you said you made the walls thicker - I wonder what you actually did? IMHO and how I always work is that line width = nozzle and wall width = line width and you define the number of walls you want. Whether that 2,3,4 or whatever is up to you. And I always run with infill overlap = 15%; no scientific reason, it may be the default  that I use but it works for me. What I did change last year was to measure the width of the filament being extruded which was 0.45 not 0.40 so I changed the line width to 0.45 which of course I will recheck when a new nozzle is deployed.

@yellowshark Haha yes it did test my patience to do 50 + hour print...Yes it seems to look better but for some reason the layer height appears almost .2 layer height by the time it gets to the middle to the top of the chair.  Not sure why.  I did do several smaller chairs before and other than quality, there were no problems with fails.  The infill showing through was mainly on the big grey chair I posted earlier so my guess is the bigger the object, the more susceptible it is to this problem.  

 

Yup I changed the number for walls from 2 to 3 and that did the job.  I'm not too familiar with different nozzle gauges yet as I bought this Ultimaker used as is and I am pretty new to 3d printing.  It is very frustrating though because no matter how many atomic methods I use and adjusting the tension in the feeder it always seems to grind my filament to a pulp.  Only a whole day spent trying to take apart the feeder and putting it back together and cleaning every mm of it seems to get prints going again smoothly.  Might be the fact it's an old Ultimaker...or I got sold a lemon 🙂

[Infill showing through walls]

17 hours ago, yellowshark said:

Hi @lakerice OK here is my result.

 

 

 

 

 

 

 

 

 

 

 

 

My main settings were…

No support used - to reduce print time; so the seat front is missing a few layers!

 

(All) printer speeds           50mm/s

 

Extruder temp                   195

 

Layer height                       .15

 

Infill                                     10%

 

Walls                                   2 (set to nozzle width; my 0.4 nozzle extrudes 0.45 so my line widths are set to 0.45)

 

Cooling                               100%

 

Flow                                    100%

 

 

 

I was going to use 0.1 layer height but I had a couple of false starts including a filament failure half way through the print before this one and so pushed it up to 0.15 to reduce the print time a bit.

 

 

I did a partial test using 0.2 at 190 and there was some minimal under extrusion so I took the temp up to 195 and used that for this print but at 0.1 I would have used 190.

 

 

With an infill of 10% and 0.1 I set top layers to 15. I forgot this when I changed to 0.15 and indeed after layer 8 the seat top was fine; i.e. 1.2mm so 15 layers for 0.1 was a good guess, you would probably need another 1 or 2 layers i.e. 1.3/1.4 using 0.1 layers.

 

 

OK no two printers are the same, even if the same model. You have to consider manufacturing tolerances, hardware and firmware setup, general maintenance, slicer settings i.e. all the little hidden ones especially defaults if you do not set your own settings, and the PLA filament used.

 

But you can use these above as guidelines. On thing is for sure, you are printing too hot! I can get 50% more filament through at 30 degrees cooler than you (using 190). Having said that white filament has a reputation for being the most difficult colour to get right - which I have experienced first-hand.

 

 

I am not sure why I have so many artefacts on the legs. Pretty much standard settings for me apart from the 50mm/s and one of my go to filaments, so I am at a bit of a loss at the moment, probably this week-end's project! Will update you if I can.

 

@yellowshark wow yours turned out great!  I definitely understand not using supports to speed up the process.  It's enough to see if the chair turned out or not.  Was this the full scale or a reduced size version?  

 

So those settings are great to know.  While I was waiting for this, I printed the chair with 10% infill, .06 layer height and 40mm/s.  I changed the setting for material to default PLA in my Ultimaker 2, but in hindsight I really should have played around with the temperature because the infill inside had a lot of flaky gunk.  However, the outside turned out pretty smooth until the last few hours or so the print failed due to grinding in the feeder.  The print was about 2 days and 10 hours I think so it really sucked having it fail at that point.  I tried to edit the .gcode file to remove everything before z156 where it failed but as you'll see in my attachment, it didn't work (the nozzle bumped the chair when I tried to resume, so it was probably doomed no matter what).  

 

I'll try your settings though and see what happens!

 

Thanks again!

[Infill showing through walls]

On 5/2/2019 at 7:12 AM, geert_2 said:

I *do* think it is infill shining through, because the infill pattern in the first pic (of Cura) exactly matches the lines in the second pic (the photo). Maybe too much overlap between infill and walls? Or indeed overextrusion like yellowshark suggests: if the infill overextrudes upon slowing down at the end, causing a sort of blob, then I can imagine that this shows through, since the edge has nowhere to go but outwards. This effect would get worse at higher speeds, since the pressure in the nozzle can not immediately go down to zero when the printer slows down. Printing hotter could also increase this, I think, since the material is more molten and thus more easily flows away? But these are just educated guesses...

 

Usually I print with 100% infill, but when I occasionally print with low infill on my UM2, sometimes I also see the pattern shining through, although not so much as yours. But I print slower and cooler.

 

@geert_2 yup I think it was infill actually.  When I made the walls thicker that eliminated the problem.  

[Infill showing through walls]

Ah good to know about the PLA temp being too hot.  OK I await your print.  Thanks!

[Infill showing through walls]

@yellowshark thanks again.  So I don't have that print with me at the moment, but I tried printing this one with an even finer layer height (.06) and it looks like you're right; it is likely under-extruding.  As you can see the layers aren't printing smoothly at all.

 

To answer your questions:

 

Printer: Ultimaker 2 (not +)

layer height -  0.1 (for the purple print...new print was .06

extruder temp (220 as per the recommendation on the material reel (Colorfabb PLA)

print speed - if you used different speeds for different parts of the printing then give me all of them - 80 for the purple one and 50 for the white one I have attached.

flow % - 100%

[Infill showing through walls]

@yellowshark My print failed overnight as the material broke in the feeder and I spent all day taking apart the nozzle and feeder to clean all the filament (gotta say it is the most un-user friendly process trying to put an old Ultimaker feeder back together).  I've attached the partial print before it failed...definitely the printer speed was way too high but I also feel like .1 mm wasn't even good enough to produce a smooth print. 

 

I'm going to attach the CURA file because I'm really overwhelmed with understanding the plethora of settings and short of printing at 30 speed and .6 mm for 3 days, I can't think of what is wrong with my settings.

 

Thanks so much for your help!

UM2_updated chair for 3d printing thicker back_fixed.3mf

[Infill showing through walls]

Good point @yellowshark it might not be the infill you're seeing!  I'm still pretty new to this, so I don't know if there's some weird setting I did to cause this.  However, I did notice with .1 mm layer height in smaller prints, it was much less noticeable.  Also, my apologies; the layer height for the model in the picture was .2 and for the one I am currently printing (will be done by this time tomorrow night 🙁) it is .1 mm.  Print speed for that pic was 60 and I have upped it to 80 since it's already gonna be a 20 hour print.  It is an Ultimaker 2.  Not sure what the extruder temp  and flow % is as it's currently printing. 

[Infill showing through walls]

OK thanks I'll try that!

[Infill showing through walls]

The wall count line count is 2.

[Infill showing through walls]

I'm wondering if it's normal to have infill showing through the walls of a print?  Infill before walls is not checked in CURA so I'm not quite sure why this is happening.

[Bottom of chair not smooth]

Ah thanks!  Didn't think of the parts part.  I managed to get it to look somewhat decent after realizing there was a whole other layer of support still stuck to the chair.  But in the future when I can afford it, I will try to get a dual nozzle printer with PVA support. 

[Bottom of chair not smooth]

Hi I'm pretty new to 3d printing and I am currently using an Ultimaker 2.  I've been trying to work with supports to get this chair to have a smoother, higher quality bottom, but it doesn't seem to be working.  I've attached screenshots of the support settings as well as the CURA file.

 

Thanks!

UM2_updated chair for 3d printing thicker back_fixed.3mf