For this reason, the ratio of Z-axis to X or Y-axis strength is about 70% in extruded parts. The anisotropy of extrusion printing will guide many design decisions - since parts are built layer-by-layer, the X and Y axes (left/right and forward/back) inherently have more strength than the Z axis (up/down), which relies on adhesion between plastic layers, rather than the bonds within a plastic strand. Designing with the manufacturing process in mind can often make the difference between function and failure. Small modifications specific to extrusion printing, such as orienting a part differently on the build plate, can drastically improve performance. Sure, you can print anything that will fit inside the print volume, but that doesn’t guarantee that it will perform as desired. Only in rare cases should a part be printed from the same CAD file as the machined design. You might be surprised by how straightforward composite printing is! This article covers the general outline for printing a composite part on Markforged printers: design, reinforce, print. In this case, DFM (Design For Manufacturing) becomes DFAM - Design For Additive Manufacturing - and while your printer won’t chastise you like your machinists will for failing to consider fabrication methods in your design, the part integrity will suffer. Just as with any manufacturing process, there are optimized and non-optimized ways to design parts for 3D printing.
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