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I succesfully printed out the plane in pure nylon. Not flown yet. As you suggested i printed with 1 wall thickness. I also managed to get the fuselage 1 wall layer thick. I added a similar carbon fyber rod inside the fuselage. From the motor mount to the rear. Nylon is super strong. But with one layer it is flexible. So the entire fuselage may wobble a bit. I have to maybe add another fyber rod.
Total weight of wings, fuselage and fin is without gear +- 240 grams. Seems to be alright.
Now i am wondering of adding a 10cm more wing at each side. Don't you think that increases glide ratio quite a bit?