This is a 3x3x4 cube. You will have to use a spare core or purchase one. I used a moyu core from https://www.thecubicle.com/. This puzzle doesn't use springs, but you will need six M3 screws 16mm long. Lastly, if you want to sticker like I did, then you can purchase some standard 3x3x3 cube stickers from the same website above.
In the name of the files, it says x2, x4, or x8. This is the quantity of that piece that needs to printed for the cube.