Common mistakes when adding print supports to 3D models include over-supporting (using excess material), improper placement (missing overhangs or stress points), neglecting support removability, and ignoring how model orientation impacts support needs.
Over-supporting wastes filament and adds post-processing time; poor placement causes sagging or print failure; non-removable supports damage delicate details; bad orientation requires more supports or leaves hard-to-clean marks.
Beginners should start with auto-supports in slicers like Cura or PrusaSlicer and test small models—this helps adjust support density without wasting material while learning.