I've made this model to mount just laser module on custom Z axis modular support made by https://www.printables.com/@GregFRISON ( https://www.printables.com/model/367235-z-axis-modular-support-cnc )

Model with no gap (33mm space) might be too tight to mount laser in

So I made a model with 0.5mm gap

Printed with PETG 
0.4mm nozzle 
0.2mm layer height
30% infill

Use M3 screws both for mounting on support and for fixing laser module.