First result with HZST3D PC-PETG filament ($25/kg):
That looks pretty good when placed right on top of the background. You can see how the thicker face of the “cube” has a pretty dirty color. Not great IMHO.
A problem I see is that the top layer is printed with the boosted flow and that causes a ribbed top surface, which detracts from the transparency:
I believe that it would be good to set “top layer flow ratio” to 0.9x to back out the boosted flow. E.g., if the flow is boosted 5% from optimum (which is what I did for my sample) then it should be 0.95.
When the background is a bit away from the cube one can’t really see through all that well anymore (the ribbing is a bit part of the problem):
Overall pretty darn good first try! Thanks for the profile!
Q: do you really find that 18mm/s speed is noticeably better than something like 50mm/s?