The part is designed with the aim to be easy- printable, in fact it has a flat base and no hoverhang. In the zip file you can find various combinations of the parts, because you can choose how to personalize it. You need to print: - 1 body - 1 closing - 1 screw And to tie it to your arm you'll need some bands, you can choose varius size and various types of laces. The default one uses - a 25mm velcro elastic strap (forearm) - a 20mm nato watch band (wrist) but you can mix them or use the one that most suits your needs