TPU Test Cube Prusa MK3S with Config for Ninjaflex

thingiverse

This test cube measures 20mm in dimensions, with a 10mm hole drilled through it. The Fusion 360 file for this project can be found included as part of this package. I encountered significant difficulties while attempting to print TPU using my MK3s printer and wanted to share the solutions I discovered. To resolve adhesion issues on my PEI sheet, I followed recommendations from the Ninjatek website, which suggested applying blue tape to the sheet for printing with Ninjaflex filament. This can be found at https://ninjatek.com/printing-guidelines/. To prevent TPU from winding around the bondtech gears, I loosened the bondtech screw until it no longer caught the nut and then tightened it by just a half turn when it did catch, leaving it as loose as possible. For printing with this specific filament, which has a temperature range of 225-235 degrees Celsius, I made sure to adjust my settings accordingly. In previous runs, the TPU had been too gummy due to insufficient melting, so for the first layer, I set the temperature to 247 degrees Celsius and for the rest of the layers, I used 240 degrees Celsius. To optimize print quality, I reduced all speed settings to their lowest recommended values, including a first-layer speed of 10mm. I also referenced the config file from https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-how-do-i-print-this-printing-help/please-help-with-tpu-settings/, making adjustments as necessary. The specific settings used in this print include: * Retraction length: 2.5 * Lift Z: 0 * Retraction speed: 75 * Retraction seed: 35 * First layer temperature: 247 degrees Celsius * Other layer temperature: 240 degrees Celsius Print setting speeds were adjusted as follows: * 15: All perimeters, support material interface, and infill * 20: Infill (solid) * 10: Top solid infill * 100: Travel speed * 10: First-layer speed For your convenience, I have included the Prusaslicer .ini settings config file for the MK3s and the generated G-code. Good luck with your own prints. Note: The images provided are of an earlier version of this cube before the hole was properly centered, which has since been corrected.