My wife wanted a sign holder for her 12" light up acrylic sign. She was thinking to scale up a phone or table stand. I decided to try to custom design it. This is the result.

Designed for 10mm thick sign with a passthrough hole for the USB cord at the bottom for the lights in it.

Print it however you want. I picked PETG Natural for that almost transparent look. I printed with .8mm nozzle at .4mm layers. Print time on my A1 was 16.5 hours.