Free - Xiaopingguo

: Apply a small amount of glue to the tabs. Many hobbyists prefer double-sided tape for a cleaner finish without the "warping" that wet glue can cause.

: Pre-fold all flaps. Before applying glue, hold the pieces together to ensure you understand how the "apple" or character shape fits together. Xiaopingguo Free

: For 3D models, use a ruler and a dull edge (like a dried-out ballpoint pen) to press along the dotted lines. This creates crisp, professional-looking folds. : Apply a small amount of glue to the tabs

: Print your template on heavy cardstock if possible. Carefully cut along the solid outer lines. Xiaopingguo Free

Depending on which free resource you are using, here are the general steps for assembly: