Even before sanding those look super clean! Nice job
What do they look like on a backlit keyboard?
Small GIF of them backlit https://imgur.com/Mq1fM07
Nice! I wish my caps cast that cleanly haha. Are you using a pressure pot? How do you deal with bubbles?
Yes, I am using a pressure pot. I tried for 4 months of different types of resin and a lot of home remedies to get rid of bubbles and nothing worked like I wanted it to. I just had to bite the bullet and get a pressure pot, It's been the best thing I have done for my casts!
The best cast I had without it though was using ArtResin it's an epoxy resin that isn't supposed to yellow. Just make sure you have a good amount of mold release every time or you'll say bye bye to your stems haha. And a lot of patience, it takes around 72 hours for it to fully harden up