**Adjust the perimeters to get it solid.** I printed in ABS, It might work in TPU/TPE, but I'm not sure. Nylon is another recommended material. I believe PLA might work as well. It's not as strong as ABS or Nylon, but this part doesn't need to be rock solid. **Print 2 in the same orientation of the file. Add supports if your printer can't handle it without supports.** After it's done, sand it out (if needed) to make sure all surfaces and corners are really smooth so it won't grind the goggles stripe. Attach it on the helmet using 3M double side tape, velcro or just glue it. It's up to you.