problems with the edges of my model

[duffy-london 0]

Hi guys

I have a problem with my U2.

I'm printing some components that need to be screw to each other.

I printed fine until I changed the material. The new one is exactly the same PLA, but from another brand, the settings are exactly the same but the results no.

the bigger problem are the edges, not precise at all and so impossible to be used.

I tried to change settings and rebuild the plate.... I have now no clue what to do.

I also tried to print with a ultimaker material with an old file (always printed with no problems in the past) and i have the same bad result. :(

does anyone got the same problem?

thanks!!!

Jess

 

[yellowshark 153]

Hi Duffy the first thing to realise that different PLAs from the same manufacturer may need different settings to get the flow correct, let alone using PLA from different manufacturers even if the colour is the same. It would be useful if you could give us your primary settings used for the original print and the after print.

Regarding the screw surfaces are you sure you were using the same fan setting what was it?

Looking at the top of the bottom surface and the top of the top surface that is pillowing. To fix that that you need one of or all of – fans full on, use a thicker layer resolution, print slower. Difficult to be exact without your settings. Given that and the screw thread I do suspect your fans were not on.

I suppose there might be some under extrusion, maybe you got a blockage as a result of the filament change but not convinced on that. Can you do an atomic pull? Maybe worth doing that after addressing the pillowing if you are still having problems.

 

 

[yellowshark 153]

... sorry, with regards to my penultimate para you may well want to increase "Bottom/Top" thickness under Fill on the Basic tab. 1.2mm would not be OTT - again without knowing your settings not possible to be precise. What brand/colour filament is the one that is causing problems?

 

[yellowshark 153]

...oh and if you are still struggling try increasing your infill; 40%+ normally overcomes it as it makes it easier for the solid layers to adhere to the infill compared to say 20%

 

[gr5 2,172]

Surprisingly, both of your symptoms (bad overhangs and pillowing on top surfaces) are fixed with "more fan". Maybe your fans broke? The wiring inside the head is a bit fragile. Of maybe you disabled fans in Cura?

If the fans are working I would then try lowering printing temp. Try lowering a lot. If you normally print 220C, try maybe 190C but print very slow - maybe 20mm/sec. Different brands and colors of PLA have different viscosity at a given temperature.

Also consider buying some filament from another manufacturer. Some brands just aren't as good.

What layer height are you printing? The ideal overhang quality has a sweet spot around .1 to .2mm layer height. If you go much thinner or thicker you get worse results. I'm not sure what the ideal thickness is but it's usually around .1 or .2mm.

 

[gr5 2,172]

Oh - and pillowing tends to be worse with thin layer heights - so a .05mm layer height is more likely to get the pillowing effect because the individual "strands" of PLA being laid down over the support grid are more likely to snap.

 

[duffy-london 0]

HI guys!

thanks for your help, I'm now trying to print with an Ultimaker blue filament and I still have the same problems, so there is something wrong in my settings and not with the material itself.

To give you a better idea:

layer height: 0.2

shell thickness: 0.8

bottom/top thickness: 1.2

density: 20

print speed: 40

initial layer thickness: 0.2

travel speed: 150

The fans are working 100% and the temperature now is 200

have a good monday!

 

[personal-drones 44]

May I suggest you try layer height 0.1, print speed 30, bed temp 55, temperature 205

 

HI guys!

thanks for your help, I'm now trying to print with an Ultimaker blue filament and I still have the same problems, so there is something wrong in my settings and not with the material itself.

To give you a better idea:

layer height: 0.2

shell thickness: 0.8

bottom/top thickness: 1.2

density: 20

print speed: 40

initial layer thickness: 0.2

travel speed: 150

The fans are working 100% and the temperature now is 200

have a good monday!

 

[yellowshark 153]

Oh dear, those settings look to me to be fine to avoid pillowing. I am going to suggest two things. Firstly move the infill to 40%. I appreciate that for the actual print you may not want to do that but for resolving your problem I think it can only help. Also it may well work for some filaments but I I think .200 at 40mm/s and 200c must be on the borderline. I would be inclined for the moment to take the temp to 205 or 210; maybe 210 you can always then back off.

I would be inclined to not move the .200 depth until the pillowing is resolved; going thinner will only make it more difficult to resolve. Of course for your threads you may well want to do that. I have not printed many threads but I suspect that for the 2 or 3 that I have done I used .100

Have you tried going back to your original brand? If you have run out then I would try a third filament if you have one.

When you say the fans are 100% is that 100% working or 100% working at 100%? When your fans are coming on strong say 50% going to 100% do you see the extruder temp dropping? On my printer, which is not a UM, my extruder will drop 5 degrees+ when the fans start charging, I ramp them up steeply after layer 2 or 3