All parts could be printed without any support according to your printer and set-up.

Rail support and Tube holder can be attached with M5 screw and bolt.

The bulb holder has not been designed and not shown on the 3D cut view.  according to you model, tube lenght could need some adjustement to reflect your assembly. in my case, bulb and bulb's holder measured 55mm .

In fact, the light support could merged with the spool holder, in order to have only one bracket…. it could be nice improvement .