Infill not touching walls

[anwofi 0]

Hello fellow ultimaker owners,

a month ago i've bought an ultimaker and so far i'm quite satisfied with it.

One thing that bothers me however is that the infill doesn't touch the walls which leads to small gaps in between. (fig. 1,2)

I'm quite sure that this isn't a hardware problem as i've checked carefully for loose straps or screws.

As software i'm using Cura 13.03/12.12A. I've tested several settings for wall thickness, infill ratio and temperature. I've also increased the infill overlap up to 100% with only minor improvement.

It seems to me that Cura just underestimates the width of infill especially for round structures.

Does anyone have any suggestions?

Regards,

Andreas

 

[Daid 298]

Usually this is a backlash problem caused by slack in the short belts. Which can be solved by unscrewing the X/Y motors a bit, pushing them down, and screwing them down tightly.

EDIT: Also, I'm thinking about adding a disclaimer, "Every time someone suggests the infill not touching the walls problem is caused by software I will kill a puppy." Because if you print with normal PLA (flex is different) and your machine doesn't have backlash, then the walls will touch the infill fine. Increasing the infill-overlap is NOT the correct way to counter this. It's a mechanical problem with a mechanical fix.

[gr5 1,516]

What is your print speed? I've seen this before but not this bad - I certainly don't have this problem at 70mm/sec.

 

[joergen 1]

EDIT: Also, I'm thinking about adding a disclaimer, "Every time someone suggests the infill not touching the walls problem is caused by software I will kill a puppy." Because if you print with normal PLA (flex is different) and your machine doesn't have backlash, then the walls will touch the infill fine. Increasing the infill-overlap is NOT the correct way to counter this. It's a mechanical problem with a mechanical fix.

 

I feel some form of bias here: aren't you a cat owner, and therefore much more inclined to kill a puppy, than a kitten? (not suggesting that you do actually harm any animals, but it falls squarely into my most favorite info graphic: http://markandrewgoetz.com/blog/wp-content/uploads/2009/11/tufte-wallpaper.png )

 

[anwofi 0]

Hi again,

Daid was completely right the XY straps were far too loose, also the XY-axis were misalinged.

After fixing this prints are now completely smooth and i'm even more impressed with printing quality. (Fig. 1)

I wasn't aware of the fact that mechanical vibrations and dampening are this crucial. Well, i just should have asked earlier on this forum instead of spending tons of time tinkering with the superb Cura.

Regards,

Andreas