This is made for the Gulikit KingKong 2 Pro controller. I have not tested it with their other models, but it might work with them too.

Main Features

• Pass-throughs for the back buttons (turn off, switch modes, pair)
• A hole for the charging port
• Holes for the back LEDs and letters for the modes
• A “leg” so you can put it down without taking out the phone
• A protrusion that lines up with a notch on the botton of the controller to make sure that the holder cannot slide side to side.

Printing recommendations

• I used PETG because it needs to flex to get on and off the controller. PLA should be fine too, just use fewer perimeters so it's easier to get on and off.
• The model can only be printed in one orientation. Do not flip it or the buttons will not print properly.

Post-printing

• Use sidecutters to cut the little stems that the buttons grow from (see picture). Make sure you do it both on the inside and on the outside.
• Move the buttons back and forth with your fingers a bunch of times untill they can move really easily.
• Put the holder on the controller and test the buttons. They should feel just like the original ones. If they don't, take it off and continue moving the buttons back and forth manually. Repeat untill they are perfect.
• Use a rubber band for the phone mount

Note: the link to Aliexpress at the top is an affiliate one, so i will get a small reward if you buy the controller from it.