Do you need transparent parts, or would translucent be good enough? It's hard to get truly transparent parts by 3D printing. It's easier with a resin printer than a filament printer. There are many web pages on polishing 3D printed resin.

If you only need a few parts, you might want to consider a 3D printing service that prints transparent materials. Here's one (I haven't tried them, so I don't know if they are any good.)
https://forerunner3d.com/3d-printed-...printed-parts/