Certainly precise enough to slap a doodad onto a respirator with some 3M VHB tape!
If you ever want to try again, you could try with photogrammetry.
If you've never heard of it, it uses multiple pictures of the same subject to produce a 3D model automatically. Here's a link to a video showing off Meshroom. The link jumps a few minutes into the video to show off the point cloud generated from the images.
https://youtu.be/yKbyVDK2Ep8?t=520
I can't speak for the quality of the video overall, but I do like this guy's channel. I have used Meshroom myself to genetate models. Note: it requires an Nvidia GPU. Although, I hear there's an AMD compatible fork called MeshroomCL.
One thing you need to worry about when doing photogrammetry is having a precise scale reference on the object. The software has no idea if you're taking pictures of a tiny elephant or a real elephant. So you need this scale reference on the object so you can precisely scale the object up or down later to have the real size. It can either be some feature on the object itself that you can measure very precisely, or you can tape a little printed ruler on the object (if there's a flat surface), or even just two marks that are a known distance apart. Basically put two tiny pen marks on the objects and then measure the straight line distance between them using digital calipers. The further apart they are, the better.
And then you can use normal 3D modeling software to use this generated object to make Boolean subtractions from some shape you made. This lets you 3D print an object that perfectly mates to the thing you scanned. However, the scanned object is often just an empty shell and you will have to give it some volume before you can use it for Boolean operations. I think I used Mesh Mixer for that.
In your example, you would have a model of the respirator, and you could use that to subtract from some eyeglass holder that you design, and then it would mate perfectly to your respirator. You could use glue or epoxy to attach the printed object to the respirator.
I got one. Had to click "Continue" about 100 times to checkout. Took over 30 minutes. And I had the required funds in my Steam Wallet.
The universe was created by Cthulhu.
apt dist-upgrade. No first dash.
Notice it's apt not apt-get. That's all they were saying.
Solomon's Key for NES is timeless.
Every number is divisible by pi.
Korean has a perfectly phonetic written language. It was invented by King Sejong and his scholars in 1444 specifically to be phonetic. Koreans probably use "Tyranasaurus" and "tiramisu" pronounced as-is, and the translator app translated the portmanteau phonetically to English.
That's my hypothesis.
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Quibblekrust
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Can you feel it in your bones as you use it?