3D Print QR Code

Hey Uneed!
I built this because I wanted to 3D print a QR code and every tool I tried was either paywalled, forced a signup, or handed me a static STL I couldn't modify. Half the time the mesh wasn't even watertight, so the slicer would complain or the print would come out weird.
3dprintqrcode.com is my fix for that. It runs entirely in your browser and nothing gets uploaded anywhere. You paste a link (or any text), tweak the config until the preview looks right, and download the STL. That's the whole thing.
A few things you can actually control, since most tools don't let you:

Pick a size preset or set your own dimensions
Adjust base height and QR height separately, so the code stands out in relief
Add a hole if you want to hang it on a keychain or lanyard
Drop a label underneath with a custom font size
Add an icon in the center (scan-safe, won't break reading)
Invert it, round the corners, whatever you need

The part I spent the most time on: watertightness. I tested the generator across 700+ configurations to make sure the mesh is always clean and printable, no matter how weird your settings get. You shouldn't have to babysit the slicer.