This is my design to avoid wobble on the hotend caused by a not straight z-rod.
This thing avoids both wobble and nut backlash by isolating the x and y movement of the z-rod.
Of course you can solve all these problems by buying a very G$$D quality z-rod. :-)
Z-isolator in action:
The entire systems is composed by 3 modifications and 1 optional improvement, more details on the images.
To assemble this z-isolator you'll need:
- 2 printed z-isolator;
- 4 M8 nuts;
- 2 springs;
To assemble the full solution:
- Drill your x-ends to enable the x/y movement of the z rod;
- Install some z-constraint at the z-rod top (e.g. thing:9864);
- Install your new printed z-isolator right below your current x-ends;
- Alternatively install your flexible z-couplers .