I have read all that, but will look over it again. I keep getting an error message when I try to import your Cura profile. I'll attach a pic. If it helps any I'm running an Ender 3 on Cura 4.4.1. Ignore the "thinwall plane" profile. I've taken your settings you posted on the thingiverse page and for the most part copied them straight over to Cura. Is your Cura profile set to .25 layer height? I think that may be part of the problem. If you could set it to .2 and post the file here I'd be greatful! View attachment 155271
I couldn't get the cura profile to see the thin wall items either so here is what i did. I am using 4.2.1 and haven't updated for fear of it not working again.
I installed a Prusa MK2 printer into cura and used localfiend's profile for that printer, but to make that work, i had to change the settings for the printer back to my ender 3 for build plate and height, plus the settings for the print head. ( i just copied them from the ender 3 settings already in cura) then Ialso had to change some of the print settings for retraction and other ender 3 specific items to get good prints.
If you go this route and want my profile I built up, i can send it to you. I know this sounds like a lot, but it was't that bad. This was the only way I could get Cura to see the inner structures of the wings and print them.