Print your own transparent PETG or PCTG parts and dial in your parameter using this small model. Print time ~1h.

My baseline settings

0.4 mm nozzle

230 °C nozzle

80 °C bed

0.12 mm layers

1 perimeter

0 top/bottom layers

100% aligned rectilinear infill

102% flow

0% cooling

15 mm/s print speed

Rygar1432 recommended OVERTURE PETG and I used dasFilament PETG for my tests.