About this 3D model

This is an upgrade for creality ender 3 and other printer use Bowden Extruder, you can print TPU or Flex filament and the PTFE tube can't move. I've use a thingiverse design of Joshvv and i rebuild on Solidworks. https://www.thingiverse.com/thing:2144277 My upgrade is a space for an M6 nut because the original design is made of full PLA, by dint of screwing/unscrewing, the tube get out. For make that, you need an M6 nut !