I wanted to run the Peopoly Moai heater cord through the acrylic wall, but I wanted to limit the amount of UV coming in the hole I drilled. Enter this thing... I created a 3-part printable cord cover / gasket that allows me to run the heater cord (including ferrite bead) through a 16-18mm hole drilled in the acrylic (3/4" works fine for those without metric drill bits available), and then run that through the hole in a plastic 'nut' that goes inside the acrylic.
On the OUTSIDE, there's a two-part plastic bolt that has a thread (to join with the nut inside) and fits over the cord itself (which is about 4mm in diameter).
You can then slide the bolt through the hole you drilled in the acrylic and into the nut inside, screwing it closed. It leaves just enough space for the thickness of the acrylic, and effectively (if you use an opaque filament/resin to print it) blocks out any stray UV coming in.
This really needs 0.1mm or better so you can get clean threads.
All pieces should import in the orientation that you will want to print them. I made sure to make angles essentially 45 degrees for anything that might require supports, so supports should NOT be necessary (it makes things messy if you use supports).