When orienting FDM 3D models, makers should minimize overhangs (to reduce supports), align critical features with the build plate (for strength), and use the largest flat surface as a baseline.
Overhangs steeper than 45° usually need supports—rotating to lower angles cuts post-processing. Critical parts (like load-bearing edges) parallel to the Z-axis (layer direction) are stronger, since FDM layers bond best vertically. For example, a cup’s handle might be oriented so its curve stays under 45° (no supports) and its attachment to the cup is on the plate (stronger).
If unsure, start with the model’s largest flat surface on the plate—it’s a safe starting point. Adjust later if you see overhangs or weak spots (like a fragile top).