After printing the original file I had some stability issues when mounting the assembly so I made a few small revisions to the models. Additionally, I added a rectangular opening for my ancient Logitech webcam that doesn't have a mounting thread. I had difficulties modifying the converted source stl-to-solid models in Fusion so I built my own as a spiritual sequel to the OG. To accommodate for any fit differences due to printer/filament/etc. I designed these to have a slight interference fit that can be lightly sanded to have a snug but not immobile fit. The new assembly works great. If this model helps you please let me know. I added the step files if anyone decides they want to start their own webcam mount journey. Revisions to the original listed below:

• Modified the hinge to remove the clearance for a nut on the bottom. I designed this to be used with a printed pin so the nut clearance wasn't necessary.
• Changed interfacing areas (hinge male/female, pin to holes) to have thicker, consistent dimensions.
• Added thickness to several areas.

Creality

Ender 3

No

Yes

0.2 mm

20% for arm, 50% for hinge, 100% for pin

I swapped back and forth between imperial and mm in Fusion a few times so you may need to check that your not trying to print an arm that is 25 inches tall. If so just scale it by 25.4 as needed.

All parts have an interference fit so you will need to sand/file them to get the fit you want. My printer had some issues with the interior upper surface (infill pattern was just clear of being proud with wall), but I'm not sure if that was just due to my printer or if that will be present every time. If so, it may be necessary to sand that away, but it did not take very long to do.