> For the complete documentation index, see [llms.txt](https://docs.cartographer3d.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cartographer3d.com/cartographer-probe/features/z-backlash-estimation.md). # Z Backlash Estimation We can measure any backlash on the z movements.\ This is useful to increase the precision on any moves done by the Cartographe3D plugin, but also useful to diagnose problems in Z motions, like belt tension and lead screws. You can run `CARTOGRAPHER_ESTIMATE_BACKLASH CALIBRATE=1` to calibrate the backlash at your zero reference position. Can move your toolhead to anywhere on the plate and run `CARTOGRAPHER_ESTIMATE_BACKLASH` for that position. Your backlash should be similar on all spots on your plate.\ A good test is to run backlash estimation close by your mounting points for whatever drives your Z. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.cartographer3d.com/cartographer-probe/features/z-backlash-estimation.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.