I'm testing a bunch of filaments I have on hand and ran some Rigid Ink I had from a Maker's Box shipment. Rigid Ink prints flawlessly on the Cetus!
As for clear, I'm pretty sure the likes of PETG will print much more clear than natural PLA. Natural PLA is more like milk bottle clear (i.e. not really clear). I've not yet printed PETG on any of my printers but have another sample from Maker's Box; even in filament form, PETG is much more clear than natural PLA.
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