Which is, straight up, the best hairline I’ve ever made!
I use a fine-tipped paintbrush, but there’s no need for finesse:
After the paint has cured a bit, peeling the film removes everything that isn’t inside the trench:
The clouds on the clear side come from PETG vapor condensing on the transparent film protecting the bottom of the cursor.
A closer look through the cursor shows bubbles in the bottom of the trench, presumably from boiling PETG:
The hairline measures 0.3 mm across and, unlike previous attempts, is perfectly consistent from end to end.
Now I can go into mass production:
I love it when a plan comes together …