Homage Tektronix Circuit Computer: Laser-Engraved Painted Hairline

Having established that laser-engraving the hairline fuses the protective film to the PETG cursor, I wondered if the bond would allow filling the hairline by painting it with good old Testors enamel:

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 …