If there is an opportunity not to follow directions, someone will

Things are always easier if you have fewer parts to manage

The more you handle a product, the more defects get introduced

4. Screws are bad, but glue and tape are worse
5. Material will never stay where you put it and tries to go back where it started
6. The tool has to get into and out of the part
7. Unpredictable things happen when the material goes from liquid to solid
8. Material does not like sharp corners
9. Vibration is your enemy
1. Best DFM will fail if the process is not controlled
11. Know when to break the rules.