I started by gluing all the parts together using cyanoacrylate and epoxy glue then i sanded it with 180 grit wall sandpaper and i covered it all with 3M acryl-green glazing putty that i disolved in acetone to apply it wioth a paint brush to fill in layer lines. I then wet sanded the helmet with 240 grit wall sandpaper and primed and painted it with automotive primer and paint.
Here are the videos i used to make it :
The author remixed this model. Imported from Thingiverse.
I cutted down vek3d's helmet for it to fit on ender 3 like printers. I also made a face version that allow breathing better so glasses wearers won't end up with fog on their glasses.