The problem is a vacuum former with heater.
Vacuum by vacuum cleaner. Heater is heat gun. Keycap mount is the heart of this instrument. Sublimation transfer sheet is not very flexible, so I made flat plane by keycap mount.
Result:
Terrible.
Cause:
1. There was gap between sheet and keycap.
2. There was airflow at the gap.
What should I do?:
Sealant like silicone grease may be a solution for the airflow. The gap is more difficult. It suggests insufficient pressure. Better keycap mount? More powerful vacuum cleaner? Or should I abandon vacuum and modify electric hot plate? I'll try better sealing first tomorrow...
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