You might recall last month that I posted about my 3D-printed spectacles.
Enough people asked me for the files and for details on how to order lenses and mount them into the frames that I figured I’d release everything with instructions - and also redesign the hinges a bit so the temples fold more compact, something I meant to do for some time.
The lense cost is usually whatever your health insurance is willing to pay.
If it’s only $40, the lenses cost $40.