my 15W LaserMaster makes a poor dot so I wanted to use a G8 or G7(3 element) lens but the oring of the lens holder will not interface with the laser head to hold the lens from falling out. So I recreated the lens holder and extended it.

Stock length is not knurled and small knob OD. Knurled versions have 30mm OD knob.
2 sizes of o-rings it seems so I have posted a knurled versions with 1mm OD and a 1.1mm OD.

Creality

Ender 3

No

No

0.2

25%

I used Polyflex TPU, with tree supports with the camera mount printed on its side.
Print Speed of 20mm/s.