I purchased an adjustable tablet/phone arm holder to use while in bed. The arm comes with a mounting bracket that's attached on a shelf or bed head and hand tightened. Cause of the weight and fulcrum point, the bracket would rotate and cause the arm to "droop."
So I designed a couple of 90° brackets and threaded bolt and nut to hold the mounting bracket in place.
I chose this manufacturer cause they printed in PETG and had the colours I was after. There were some issues with the id size of the nut and I was notified about the issue and offered a solution and printed additional parts at no extra cost. The 3d prints turned out great and communication was outstanding with regular updates. Only Australia Post let down the order with a delay in shipping.