this is a camera mount I made to watch my Kobra 3, it mounts on the shelf its on and can be manipulated to catch any angle you wish and is very sturdy, I printed mine out of PETG but PLA should work fine.

this Model is to function with https://makerworld.com/en/models/1101906-mechanical-arm-holder-stand-for-tablet-phone#profileId-1098048 please use this model to build out your Arm