The Ultimate Smartphone Mount w/ 1/4 Threaded Insert Hole
thingiverse
Spammington's design, but just with a hole to fit a 1/4in threaded insert for mounting to hotplates or tripods. You'll need threaded inserts, I got mine on Amazon, and a soldering iron to press them into the plastic. There's some room after the depth of the insert in case your 1/4 threaded rod goes a bit past the end. I added a bit of double sided tape on the bottom to help hold a phone a tad more securely when its in place.
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