This is an awesome model. I printed and painted it for my wife for Christmas as she's a huge Kulo fan. I also pulled the model into Fusion 360 to design a wall-mounted plaque to showcase the saber. I've posted the models for that here if anyone wants to use them.
I painted it in several layers, starting with a flat grey primer, covered by a "chrome" paint, then dry brushed on some copper, rust, gold, etc colors in various areas I wanted to highlight, added a little more "chrome" where I wanted to see some more shine, and finished it all up with an intentionally incomplete layer of "hammered black" paint before scuffing bits of it up with sandpaper to complete the weathering. Then the details (wires, etc) were painted by hand and a coat of clear enamel was added to protect it.