--- title: How to adjust the Z axis lead screw nut (BCN3D Sigma) description:     If when trying to raise the printing platform, it stays at its bottom position and makes a loud noise, probably the cause is that the lead screw nut is misaligned with the printing surface. In ord --- [Skip to content](https://support.bcn3d.com/knowledge/adjust-z-axis-nut-bcn3d-sigma#main-content) English Show submenu for translations [Contact support](https://support.bcn3d.com/knowledge/kb-tickets/new?hsLang=en) [Customer portal](https://support.bcn3d.com/repair-service?hsLang=en) ![knowledge-base-header-bcn3d-logo.png\]](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Header/knowledge-base-header-bcn3d-logo.png?height=40&name=knowledge-base-header-bcn3d-logo.png) - [Default HubSpot Blog](https://blog.bcn3d.com/) Open main navigation Close main navigation - [Default HubSpot Blog](https://blog.bcn3d.com/) - English Show submenu for translations - [Contact support](https://support.bcn3d.com/knowledge/kb-tickets/new) - [Customer portal](https://support.bcn3d.com/repair-service) - [BCN3D forum](https://www.bcn3d.com/community/) [BCN3D forum](https://www.bcn3d.com/community/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge base - BCN3D](https://support.bcn3d.com/knowledge?hsLang=en) 2. [Sigma + Sigmax](https://support.bcn3d.com/knowledge/sigma-sigmax?hsLang=en) 3. [Troubleshooting](https://support.bcn3d.com/knowledge/sigma-sigmax?hsLang=en#troubleshooting) # How to adjust the Z axis lead screw nut (BCN3D Sigma)   | **Tools** |   | | --- | --- | | ![allen-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/allen-icon.png?width=21&name=allen-icon.png) | > Allen key 2.5mm | ---   If when trying to raise the printing platform, it stays at its bottom position and makes a loud noise, probably the cause is that the lead screw nut is misaligned with the printing surface. In order to solve this follow these steps: | **1.** Loosen the three screws placed around the Z-axis lead screw. | ![screw-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/screw-icon.png?width=18&name=screw-icon.png)**x3 M3 8mm** | | --- | --- | ![adjust-z-axis-nut-1](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Sigma-Sigmax%20R19/Z%20axis%20nut%20adjust/adjust-z-axis-nut-1.png?width=500&name=adjust-z-axis-nut-1.png)   **2.** Move back and forth the lead screw to correct its position before tightening the screws again. This correction should be minimal, just enough to align the screw in a natural position.  ![adjust-z-axis-nut-2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Sigma-Sigmax%20R19/Z%20axis%20nut%20adjust/adjust-z-axis-nut-2.png?width=500&name=adjust-z-axis-nut-2.png) **Note:** If you can't tighten the screws, try to spin a little the lead screw to align the holes of the nut with the holes of the printing platform.   **3.** Go to *Utilities/Calibration/Printing surface calibration* and follow the steps. Verify if the printer can now raise the platform. It's possible that you have to repeat this process to get it perfectly aligned.   ![](https://support.bcn3d.com/hs-fs/hubfs/image-png-Sep-03-2020-01-23-06-39-PM.png?width=400&name=image-png-Sep-03-2020-01-23-06-39-PM.png)   **Conclusions** If you can't move the printer surface after following these guidelines, please check the flat cables connections, check out this article: [How to check flat cable connections (BCN3D Sigma)](https://support.bcn3d.com/knowledge/check-flat-cable-connections-bcn3d-sigma?hsLang=en)   If the printing surface still doesn't move after checking the flat cables, please contact with the BCN3D support team by filling this [form](https://support.bcn3d.com/knowledge/kb-tickets/new?hsLang=en). #### **[Forum community](https://support.bcn3d.com/knowledge/bcn3d-forum-community?hsLang=en) ** Repair didn’t go as planned? Check out our **[forum community](https://support.bcn3d.com/knowledge/bcn3d-forum-community?hsLang=en) **for troubleshooting help.   It's important to keep your printer in good shape to make the most out of it. In this chart you can find a list of the extruder maintenance procedures and how frequently these should be done. [Maintenance Plan](https://support.bcn3d.com/knowledge/maintenance-plan-bcn3d-sigmax?hsLang=en)   ![bcn3d-recycle](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/bcn3d-recycle.png?width=27&name=bcn3d-recycle.png)  Take your e-waste to a certified recycler. [Check how we do it in BCN3D.](https://support.bcn3d.com/knowledge/environment-bcn3d?hsLang=en)   | --- #### RELATED ARTICLES | | --- | | [![maintenance eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/maintenance%20eng.png?width=336&name=maintenance%20eng.png)](https://support.bcn3d.com/knowledge/maintenance-plan-bcn3d-sigma?hsLang=en)   | [![clean axes EN](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/clean%20axes%20EN.png?width=336&name=clean%20axes%20EN.png)](https://support.bcn3d.com/knowledge/clean-lubricate-axes-bcn3d-sigma?hsLang=en)   | | --- | --- | | **You can help improve the BCN3D Knowledge Base.** If you feel there are guides that we are missing or you found any error, please use this form to report it. **[Report form](https://share.hsforms.com/1F7t1sBuOQyWlAeRwwFSjgQ3fec5)** :) | | --- | - 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