Round object is transparent and not printable

[tommasoconti98 0]

Hi to everyone, I have a problem with the following file. I am trying to print this thing, but the round objet in the highest part, doesn't show up in the preview section (it is transparent) and I can't find a way to print it. I have attached the .stl file and two photo, one in the prepare section (where I see the object) and on in the preview section (where it became transparent). There is someone who can help to to solve this? Thanks

Crazy cart.stl

[Curven 28]

Hello,

I checked your file and think I found the problem. The walls of this round part are to thin. On our Ultimaker with 0.4mm it will only print if the option "Print thin walls" in the shell section of the settings is activated.

But it will be thin and break easily.

If you have acces tu the 3d model I would advise you to make larger walls on your model.