A slow #3DPrinting experiment for me at the moment is making a clear, solid window through a 3D printed part.
This test piece is 40x40x5mm in size, has a 10mm hole bored through it, and then a square fill hole in through the top.
I'm using Glasscoat 2-part epoxy, which doesn't adhere to plastic, so I clamped the part between two shiny bits of acrylic and poured it in from the top.
A ton of bubbles came out of the print during curing - I will try sealing V2 with something before epoxying it.