I used my Creality 3D printer and 1.75 mm white PLA filament to print the parts. I will recommend using ABS or PTEG filament instead of using PLA. I have used PLA just for the quick test as I don't have ABS or PTEG filament in my stock.

My print settings are:

Print Speed : 60 mm/s

Layer Height: 0.3mm

Fill Density: 25%

Extruder Temperature: 210 deg C

Bed Temp: 65 deg C

I have printed the files successfully but there are minor issues in the fitting of a few parts like M4 rods, and middle cover, and the top cover. I will adjust it soon. 

I have also checked the solar panel fitting, it works as expected.