HT is what I used to get my results. You need heat, slow speed, thin layers and preferably a bigger nozzle (0.8 nozzles just came out for the UM3 so that's sorted).
One issue with the thin layers and high temp is that you get buildup of material on the nozzle. It then burns and starts flaking off into the print leaving brown marks all over. I was using an UM2+ at the time and designed a little arm that holds a wire brush. I then created a plugin that makes the head move over to the brush and clean it off every few layers.
And then after all that you need to polish the crap out of the print. Wet sandpaper followed by a polishing wheel with polishing paste is what I used.
I posted one of my prints at the link below. I made a few more prints after that where I improved the result slightly but I never bothered taking any pics of that.
https://ultimaker.com/en/community/prints/508-ht-clear-experiment
I also gave nGen a try but didn't have much luck with it. It got cloudy quite quickly as soon as the print got up to a height where the heat from the bed wasn't contributing as much.
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gr5 2,224
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