Recommendations:

• Sizes 15x15 cm  (5.9"x5.9") or 20x20 cm (7.9"x7.9") : to fold simple or intermediate models or test folding sequences.
   
• Size 24x24 cm (9.45"x9.45"): my preference! It is an ideal size for most models. It is perfect for folding each day because it does not require a large table to spread and fold the sheet and it is large enough to fold complex models
   
• Size 35x35 cm (13.8"x13.8"): for exhibtitions or very complex models