This is the a Chainaxe. The model is split in to several pieces to fit on to a printer with a build volume of 25 x 21 x 21 cm or 9,84 x 8,3 x 8,3 in. (Example Prusa MK3) All parts are rotated for optimal printing with minimal supports.
For assembly I recommend using 1x 6mm rod with a length of 600 mm. If you have any questions please let me know. You can also see a video about the build process.