Comment by this_and_that

If you want a jankier but cheaper version, here's a (much less nice) version for about $50: https://worstplans.com/2021/05/10/led-artificial-skylight-fo...

It uses a trash can plus a super-bright LED bulb plus a plastic book magnifier.

The main trick is that you can get a big magazine-sized flat plastic fresnel lens for like 10 bucks.

The original poster's solution is definitely better, but it's also possible to do this on the cheap with no 3D printing (or in fact, any skills whatsoever).