Separation Layer

[tyman00 4]

Hi All,

I am fairly new to the scene and I have a project that I am trying to print. I've printed a few smaller items off of various repositories and that came default with the UM2. This particular print below is a file I downloaded off of Thingiverse and modified a little with TinkerCAD. In both attempts it seems to separate a little and then the inner support material was stringy from the separation up.

I did run the 10mm cylinder test a few times. My first attempts I forgot to change the temp to 230. When it would under extrude in that test I would hear the extruder skipping in the back of the machine. Once I set the right temps I was able to make it to 10mm once and then had minor under-extrusion in the 10mm ring. When that happened the extruder skipped again.

I wasn't around when the layer of the prints below had issues, so my question is the skipping causing the separation and under-extrusion?

The blue print was my first attempt and it pulled apart when I was cleaning it up. The second print is a little more structurally sound, but I could see before it finished the fill was stringy as well.

The print settings in Cura were essentially the default "Ulti quality" quick print profile settings copied over to advanced where I turned on brim. I'm still learning so I figured this would be my safest route.

Any insight or suggestions is appreciated!

https://drive.google.com/file/d/0B7GrDV-FVlnYXzRRWDh6RkllNlk/view?usp=sharing

https://drive.google.com/open?id=0B7GrDV-FVlnYVndOOHZMM21INUE&authuser=0

https://drive.google.com/open?id=0B7GrDV-FVlnYRHFqSWhBZkVjaE0&authuser=0

https://drive.google.com/open?id=0B7GrDV-FVlnYUDZJejVTRTJ0MUk&authuser=0

https://drive.google.com/open?id=0B7GrDV-FVlnYc0RTRmoxTGFOZG8&authuser=0

 

[gr5 2,181]

The single bad layer in the white print is probably due to a tangle in your filament. Next time maybe uncoil more of the filament, or maybe put it on the floor or check that it isn't kind of in a knot by unrolling a few meters and rolling it back up.

The blue part looks underextruded inside. Try not to go over the below speeds for *.2mm* layers. For .1mm layers for example you can go twice as fast:

20mm/sec at 200C

30mm/sec at 210C

40mm/sec at 225C

50mm/sec at 240C

 

 

[tyman00 4]

Thanks! The blue print looked identical to the white until I pulled it apart. Originally I thought it drug some of the external support structure around a little so I tried the white print next without support. Before the white finished I could see inside and it looked similar to the blue. I'll try your suggestions later this weekend and report back.

[tyman00 4]

@gr5 - If I want to print at a layer height between .06mm and .099mm do I need to adjust my speed or temps?

Will I get that much better quality or detail by going below .1mm?