Just cut a hole in each piece for the laser pointer to slip in.

Print both pieces of the handle.

I recommend printing a few layers as a test to make sure it fits your laser pointer. If not, scale appropriately.

Print the button on its side, I recommend scaling up 2X, or to your pref.

Drill a hole where the button for your laser pointer lines up with the notch for it and insert button. Some filing may be necessary to accomodate the button without depressing it when the pointer is inserted.

Enjoy.