Fusion3’s F410 3D printer prints most flexible materials very well including those made from TPU, TPE, Nylon and PCTPE. We have found that NinjaTek’s Ninja-FlexTM material is the only prominent flexible material that does not work well with our printers. We have certified materials very similar to Ninja-flex that you can use as a substitute. Please contact our support team if you require assistance in identifying a flexible material for your particular application.