A ball jointed printable tripod.

• Measure the width of your phone (or google for its specs), and select the closest size Phone Clamp. If you use a phone case or something, make sure to use the total width including the case.
• Print (at least) the Phone Clamp in PETG (or other material that's springy, and doesn't deform over time). This part must be printed with supports. Use some sandpaper to smooth out the support interface area on the ball.
• Print three of the Tripod Leg (PLA is fine)
• An M5 x 40mm bolt is needed for assembly (longer works too, but it will stick out and look ugly).

Assembly:

• Fasten the legs first, as this can require a bit of force. Place the tripod base upside down on a flat surface. Be sure to align the notches of each leg witch the small bumps inside of the grooves for the legs. Press straight down, but be careful so you don't hurt yourself if something slips. Using leather gloves might be a good idea.
• Use a screwdriver to slightly widen the gap of the Tripod Base ball joint and push the phone clamp in place.
• Side the M5 bolt through the printed screw. If it's difficult to get the last bit of the bolt head seated, use an M5 nut on the other end to pull the bolt through.
• The bolt hole is threaded in the design, but depending on your printer settings, it might be a bit tight. You can put a small amount of grease on the very end of the bolt for smoother operation.