With my old jigs, front side of keycap warps when I print on front side. Now I'm trying to improve it.
My new jigs:
They enforces keycaps while printing.
The result:
Zero warp!
BTW I'm making Emacs keycaps:

Small letters are 3.6 pt. They are ornamental things, of course. But I feel the typography isn't best.
I found a problem:
Two green legends should be the same color. New jigs caused temperature inconsistency! I should try another way...