I had new progressive lenses made, but the old ones are still fine and don’t have a scratch. They’re just a bit weak at near distance, but otherwise perfectly serviceable.
So I made new frames for them because I don’t like to throw away things that work.
All assembled, the frames weigh 3.5 grams, and 14 grams with the lenses mounted.
This was printed with a Prusa Mk4 and regular PLA at 0.15 mm layer height. The hinges use simple 10x1 pins - and I worked my magic to print the holes horizontally to the final dimension with interference fit, so no reaming or drilling is necessary. These glasses are straight out of the printer with zero rework.
I think they look pretty good as they are. If anybody notices they’re 3D-printed, I’ll say I’m gunning for that particular style 🙂
The front of the frames prints in 11 minutes and both temples in 12 minutes. I could break and make a new pair every day for the rest of my life and it would still be faster and cheaper than going to Specsavers only once.
How many different versions did you have to make?
Designing ergonomic things is a bitch.
Not very many. Those lenses were mounted in silver nickel frames I made myself too, so the ergonomics had been sorted out a long time ago. I simply copied the geometry of my metal frames.
I think I corrected the front of the frames twice - once to lower the greater diameter by 0.5mm because the bevel isn't completely identlcal to my metal frames' and once because the Prusa Mk4 didn't print the nose bridge right, so I added that horizontal bar as a support. And I lenghtened the temples by 5 mm, is all.