Sawang Optical on Nimman road has a titanium welder guy in Bangkok that they use. My eyeglasses were welded and repaired in a week, including EMS to bangkok and back. Excellent work at a very reasonable cost.
Jipata just off Sirimangkalajarn road does this.
The Hash guys get theirs printed by a member who owns a shirt printing shop, but his prices were higher than Jipata when I went to check.
Jipata does huge orders for large companies or smaller lots.
Flying domestic in Thailand you can use your drivers license as ID to board the flight. Don't need your passport. Doesn't have to be a Thai drivers license. Just ID with photo and name.
Wrap Monster also wrap helmets. I have a few friends who have done this. You don't have to settle for just white... they can print any pattern or photo on the vinyl as well.