I have two printers a Robo 200x200x200mm build size and a TMTCTW Jupiter 2 300mmx200mmx360mm build size of course You can print props but to do a wearable helmet if your printer could print it in one go You would probably grow a beard quicker!! all of the items in the pic were 3d printed apart from the lawgiver and the HIC Star trek badges noisy cricket wolverine claws to name but a few. Big prints take alooongg time and that is when it completes some get to 90% then stop.Go and look on thingiverse then buy your printer. good luck