Inner and outer wall are not attached

[nick-leijenhorst 0]

Whenever I print with my ultimaker I notice my inner and outer walls are not touching. I usually print with an 0.8mm shell thickness, which causes 2 layers to form the shell. But for some reason there is a super tiny gap between them... Does anyone know how I could fix this?

 

[alex-marakesch 0]

Please post some photo, if you want to receive any advice. But it is probably problem with belt tension.

 

[illuminarti 18]

Yes, photos would help a lot. Is it not touching all the way around, or just on certain areas? If its the former, then it's probably due to extruding just a little bit less than it should all the time. If it's just in certain areas, then it's probably a belt tension issue causing backlash, which means that the head stops short on some moves.

Also what slicer and version are you using?

 

[nick-leijenhorst 0]

I should get my camera back tonight, then I'll snap some pictures. In the meantime I'll try to explain how it looks.

I've had my Ultimaker only for a few days, so the belts are still very tight. But I do notice subtle signs of underextrusion on some parts of my print. I think this is also due to my filament thickness being just a little thinner then I specified in Cura. My digital calipers should arrive tomorrow or the day after, so I wouldn't be suprised if it's just a little bit thinner than 2.85 mm.....

I am looking at some of my previous prints... and I can see that on one side of the prints, lines are a little more 'tight' than the other side. I would really love to get some feedback on this because I'm so new to printing accuracy and stuff like that. I'll get pictures as soon as possible.