We usually do mitered corners.
Supposition, not experience: Making a tight radius in noodle and having it look good would require reducing the size of the inside corner. This could be done by removal of material (kerfs or wedges) or by heating that causes the plastic of the noodle to shrink a bit. With either method, solid noodle seems more likely to make a good tight radius without flattening than a cored noodle.
Edit:
Quote:
Originally Posted by DoxCoach599
In terms of ASCII art, it would look something like this
=== |
Where "=" is a horizontal stack of two noodles
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A better picture of this is in the game manual, Figure 4-8, bottom center.