Robo3D Z Isolator v2 (with nylon nut)

thingiverse

This design performs much better as the nylon nut's washer face glides smoothly on the X carriage, while the nylon nut itself exhibits less slop on the threaded rod and minimal stiction. It effectively eliminates Z ribbing caused by bent Z screws and/or Z couplers that are not perfectly centered. This design works optimally in conjunction with a Z constraint such as http://www.thingiverse.com/thing:1124184 This design requires M8 Nylon Washer Faced nuts with a 13mm face to face distance, for instance the following ones on ebay:http://www.ebay.com.au/itm/10x-M8-NYLON-NUTS-Metric-Washer-Faced-Stud-AUS-STOCK-/181226389121?hash=item2a31ef3e81:g:HqcAAOSwwbdWMqiv Print 2 of these and press one of the nuts into each, ensuring the nut fits firmly and the guide arms have no slop on the 8mm Z guide rod but are not overly tight. I lubricated the inside of the guide arms. Remove your X carriage and Z nuts and manually screw the isolators onto the Z screws by hand until they're about an inch odd down on the Z guide rod. Avoid using the motor as this may cause the Z screw to flop around and potentially damage your Z coupler. Once you have both isolators installed at the same height, replace the X carriage and control the motors to lower the carriage. You will need to lower your Z end stop and extend the screw if applicable. Re-level the bed and conduct a test print. Print Settings: Rafts: Doesn't Matter Supports: No Resolution: 0.3mm Infill: Solid Notes: This design features no tolerance, with the nut insert precisely 13mm from flat to flat and the guide arms exactly 8mm in size. You must ensure your printer is accurately calibrated for optimal performance. Use the XY offset provided in Slic3r and S3D as I do. Minor filing or sanding may still be required to achieve a smooth print surface. My design has been printed using S3D with three perimeters.