smoothing print help

[spliffmo 0]

Attached is a couple photos of my current piece I am trying to print. I am trying to print the heart shaped gears with not awesome results. Haven't let it finish as the print is not coming out well. As you can see, the outside of the gears has some gnarly peeling effect causing bumps to form which I doubt will make the gears work smoothly. The infill has a good amount of stringing but I am not too worried about that, just figured I would show it if that helps diagnose the problem.

Settings are the default medium settings in cura and I am trying to print the whole part in one go. The only thing I changed was the nozzle temp as I was not getting good adhesion to the base plate otherwise. Had temp at 230C but I think I should have dialed it back down once I was able to get a couple good layers down. Any tips would be greatly appreciated.

Layer height 0.1mm

print speed 50mm/s

nozzle size 0.4mm

travel speed 150mm/s

minimal layer time 5s

 

 

 

[gr5 2,210]

I think I should have dialed it back down once I was able to get a couple good layers down

Yes. After the first layer - not a couple layers.

Fan is the most important fix for this. You need fan early on. I think the default is fan at 100% at 5mm so change that to 100% at 1mm and it will come on slowly over the first 10 layers. This problem you see I have not totally overcome but here are some really interesting experiments and slow motion video that explains the problem and some solutions. It's a lot to read but worth it - the initial explanations turn out to be wrong:

http://umforum.ultimaker.com/index.php?/topic/4094-raised-edges/

 

[spliffmo 0]

@gr5

Thanks for that link. Didn't really know what to search for when researching my problem so I missed that post. Very interesting experiments. I will try out the fan on at the beginning and a few other options like slowing down the speed a bit on the next print and report back.