The Mark One’s™ CFF™ build process is very similar to that of other FFF 3D printers: parts are built by fusing two-dimensional slices on top of each other. At this time, the Mark One™ does not print composite filaments in the Z-direction. However, the nylon (FFF) side of the printer works the same as other FDM/FFF 3D printers which allows for very complex geometries. Basically, users have the ability to create continuous fiber (carbon, glass, or kevlar) reinforced nylon parts. This process allows you to create parts 2-20x stiffer than ABS, while maintaining great surface finish, impact resistance, and abrasion resistance. Moreover, creating "hybrid" parts allows users to control the cost of making parts based on the mechanical property needs. The wing foot on our materials page is a great example: https://markforged.com/mark-one/the-materials/ We created a part that cost ~$10 more to make, but is considrably stiffer and ready to use in the field. It is also hard to see from the photos, but the bottom of the part is slanted about 5º to match the contour of the car – so it's not entirely flat.