I know this post is a few months old, but for documentational reason I'll write it down, I'm currently reverse engineering the keycaps to be printed out with a SLA printer, currently I only got the square keys but others will follow soon. I did this because I didn't want to pay 10 -15 Euros for an ESC keycap. The square ones came out neatly and are usable. The only issue I run into is the Mechanic, this is not easily printable. I'm trying to figure out a way to replace it by something simpled to reproduce!