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:

Tek CC - Painted Hairline - finished
Tek CC – Painted Hairline – finished

Which is, straight up, the best hairline I’ve ever made!

I use a fine-tipped paintbrush, but there’s no need for finesse:

Tek CC - Painted Hairline - mask detail
Tek CC – Painted Hairline – mask detail

After the paint has cured a bit, peeling the film removes everything that isn’t inside the trench:

Tek CC - Painted Hairline - mask removal
Tek CC – Painted Hairline – mask removal

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:

Tek CC - Painted Hairline - detail
Tek CC – Painted Hairline – detail

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:

Tek CC - Painted Hairline - production
Tek CC – Painted Hairline – production

I love it when a plan comes together …

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