All credit goes to Rafal Works - This is taken from (https://3dwarehouse.sketchup.com/model/u1602c7be-26b7-4ea3-9ad4-f580c420f769/Boba-Fett-Helmet-Dented-version) and made into individual STLs and helmet sliced into easily printable sections.
The helmet body slices are named with 3 letters the first letter (T, M, B) is for either the Top layer, Middle Layer, or Bottom Layer. The second letter (L, R) is either the left or right side of the helmet (when facing it). The final letter (F, M, R) is for the front of the helmet, the mid section of the helmet, or the rear of the helmet. These were sliced to be able to print in the limited time i have after work, but have included the main helmet body for you to slice however suits you.
I think the top mid section may be swapped (L should be R, and vise versa) - but you'll have to make that judgement call during assembly.
For a visor, a welding/grinding tinted visor works well - dark enough nobody can see in, but not too dark that you can't see out, see here (https://www.amazon.com/Hobart-770580-Shield-Replacement-Shaded/dp/B002VECKRO/ref=pd_bxgy_263_img_2?_encoding=UTF8&pd_rd_i=B002VECKRO&pd_rd_r=2f10fb26-24ea-11e9-8d89-2156212e8c69&pd_rd_w=rT9YI&pd_rd_wg=er1Rx&pf_rd_p=3f9889ac-6c45-46e8-b515-3af650557207&pf_rd_r=RKCKP8XPZ9ZEDTF47AS3&psc=1&refRID=RKCKP8XPZ9ZEDTF47AS3)