Print in ASA/ABS for less weight, print with supports.
Has been tested with a G305.
There is only one file which is the LMB, mirror the .stl in either your slicer or a 3d modeling application of your choosing to obtain the RMB.
(LMB and RMB are symmetrical, this is why that works)
I don't exactly know how much lighter it is exactly (I do not have a scale unfortunately)
I used this video to reference how to disassemble the G305, might be useful: https://youtu.be/YmcaNkwdEiI