Robo3D Z Isolator

thingiverse

UPDATE 2015-11-12: This design has been upgraded by visiting http://www.thingiverse.com/thing:1122481 Description This innovation removes Z ribbing caused by bent Z screws and/or non-centered Z couplers, with centered holes in the Z coupler being a challenge I faced. The before/after photos clearly show that this solution is effective and completely eliminates the Z ribbing for 0.3mm layer height prints like mine now. Instructions I included extra space in the design to allow the nut (13mm) some flexibility, as its precise position from flat to flat should be 13.2mm in my model. Ensure that the guide arms don't rub against each other and there's a small gap of 8mm inside them when fitted onto the Z guide rod. Verify that the nut fits tightly into place while maintaining a smooth motion between the guide arms, then apply lubricant to the inner sides of the guide arms and flat surfaces where necessary. Procedure Separate your X carriage and Z nuts by hand, ensuring they fit well into the Z isolators (which you should be able to reuse with the new setup). Attach the isolators to the Z screws, placing them approximately one inch below on the rod as shown in a secondary picture, before attempting this operation with motors attached.