What am I doing wrong??

Hi all

I am a very very beginner to Tinkercad and can't do much! I am trying to modify an item from Thingiverse. It is a stand and has two posts onto which another object is mounted.

The object is here: http://www.thingiverse.com/thing:3611725

I am trying to increase the height of the posts to 60mm. All goes well, I then export back. But when I print it out the extra section seems to get printed with less infill or something, because it just breaks off easily and I'm back where I started!




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