I made a 2D mockup in Inkscape of the glasses to use as a template for the measurements and luckily enough it fits exactly 40pt text (well 10pt scaled up 4x). Provided original SVG and exported DXF which can be imported into OpenSCAD.

BTW, those aren't my Dad's glasses, they're the only ones I had to hand to model. Hey they're not mine either right?!

Print Settings

Printer brand:

FlashForge

Printer:

Creator Pro

Rafts:

No

Supports:

Yes

Resolution:

0.30mm

Infill:

10%

Notes:

Print it as its laid out for the fewest supports - see slicer screenshot. Basically with the text on the bed not the base on the bed. You could horizontally flip it (text backwards) so the front is touching the bed resulting in the nice shiny side as the front of the text - see the "bad" version.

I printed it pretty low-res/infill as I was going to paint it anyway and wanted to keep print time down to 3 hours.

I used Hatchbox neon green PLA and brown/gold acrylic paint with no primer.