i use petg or pc or may pla crystal clear, use 1 or more layer and set ironing on every surface, comes out clear too. i will test the pvb soon and let u know how it works (edited)
Transparent Window Printing: PETG-/PVB-Composite (Proof of Concept)
This proof of concept shows how PVB and PETG can be used to print truly transparent window panes.
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updated June 18, 2021
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Thank you for the detailed description
Interesting technique. I'm able to print really transparent "windows" with clear PETG using techniques outlined in the print called "Print Glass" here on prusa page. I haven't gone for the PVB material because it seems to be really fragile.
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As for PVB being fragile: As soon as it is smoothed and all IPA has vanished PVB parts are pretty robust in my experience.
For the petG, the trick was go really slow, over extrude a little bit, and use aligned rectilinear or concentric infill, 100% infill. I don't know if ironing would help or make things smeary - but it's something to look forward to.