A chunky TPU intended print that has little ribs to grab onto your PVS14's objective lens, thereby securing itself and a 1.5" diameter acrylic circle (allowance is made for up to 3.6mm or 1/8") in place to protect your 250 dollar lens. Instead of the completely open securing/vanity ring, there is also a cover that slots in with a pinhole in the center and two fingernail-accessible grabby thingys so you can get it off. 

Note that the acrylic circle can be a VERY tight fit depending on how your TPU shrinks/expands during print. This is good, do not file the circle down to fit more easily, the TPU should stretch enough to accommodate it. Secure it with or without glue as you like. Super glue fogs up the acrylic btw, use something else.

Settings I used are pretty loosey goosey. 15% infil, like 2-3 perimeters and top/bottom thickness around 8 or so. The acrylic is what's stopping airsoft bbs and such.