The print comes in many parts that will need to be clipped together.
When clipping on the main base hook the arm on the left side than push the part up until fully clipped and the underneath is mostly flush.
For the LT and LB buttons the part will slide under the bar and then twisted to pop into the bar than the parts can be slid to place.
The D-pad buttons clip on and go in order from top to bottom(up, right, left, down)
The part that goes on the joystick gets slid on from the back and than the short are clips to the leg that goes down to a table.
The leg that goes down pushes against a table or chair (preferably padded for more grip) than all you have to do is push the controller around to move the left stick.
Print settings - (Ender 3)
Material - pla
Supports - yes
Layer height - 0.2 mm
Infill - 20%
The author hasn't provided the model origin yet.