--- title: How to install shims (Omega I60) description: In order to print in duplication and mirror mode, both heads need to be alligned in height. This can be achived through automatic layer compensation, or by installing shims in the printing heads. --- [Skip to content](https://support.bcn3d.com/knowledge/how-to-install-shims-omega-i60#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. [Omega](https://support.bcn3d.com/knowledge/omega?hsLang=en) 3. [Tips](https://support.bcn3d.com/knowledge/omega?hsLang=en#tips) # How to install shims (Omega I60) ## In order to print in duplication and mirror mode, both heads need to be alligned in height. This can be achived through automatic layer compensation, or by installing shims in the printing heads.   **![warning-2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Contact%20form/warning-2.png?width=20&height=512&name=warning-2.png)** Keep in mind that layer compensation is implemented in **FW 1.3 and above**, so any offset between the printing heads will be automatically compensated by the printer when working in duplication or mirror mode. **Content table** [Hotend spacer check and installation](https://support.bcn3d.com/knowledge/how-to-install-shims-omega-i60#hotendspacer) [Z offset measurement](https://support.bcn3d.com/knowledge/how-to-install-shims-omega-i60#Zoffset) [Shim installation ](https://support.bcn3d.com/knowledge/how-to-install-shims-omega-i60#shiminstallation) ---   #### **Hotend spacer check and installation** Before starting this procedure, you need to make sure that your printing head is equiped with a [hotend spacer](https://support.bcn3d.com/hubfs/BCN3D%20Support/Omega%20media%20(images,%20videos,%20photos%20etc.)/Hotend%20spacer.jpg?hsLang=en) on each printing head.    ![](https://support.bcn3d.com/hs-fs/hubfs/image-png-Feb-15-2024-09-18-48-1260-AM.png?width=462&height=300&name=image-png-Feb-15-2024-09-18-48-1260-AM.png)   **Having the spacer in one head** will result in a very big offset between printing heads. **Not having the spacer installed in any of the heads** will make the installation of the shims redundant. **![warning-2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Contact%20form/warning-2.png?width=20&height=512&name=warning-2.png)** In case the hotend spacers are not installed, contact support at ***omega-assistance@bcn3d.com*** If you already have the spacers, follow these steps to install them: ![](https://support.bcn3d.com/hs-fs/hubfs/BCN3D%20Support/Omega%20media%20(images,%20videos,%20photos%20etc.)/hotend%20spacer%20installation.jpg?width=452&height=402&name=hotend%20spacer%20installation.jpg) #### **Z offset measurement** To install shims in omega you need to measure the Z offset between both printing heads, as well as the consistency of these measurements. Before running this procedure, make sure that the hotends and the printing surface are clean, and that the purge tanks are properly installed so that the nozzle is properly wiped through the silicone cloth. To launch the Z calibration, go to ***settings/calibration/Z auto-calibration.*** Once the calibration has been performed, check the Z offset in the **Z auto-calibration** menu. ### ![](https://support.bcn3d.com/hs-fs/hubfs/image-png-May-02-2024-01-02-27-1809-PM.png?width=266&height=446&name=image-png-May-02-2024-01-02-27-1809-PM.png) Write down that value and repeat the proecess a second time to confirm that the measurements are consistent. #### **Shims installation** Once this is done you can proceed to install the necessary shims. One shim has a thickness of 0.05mm, so you need to divide the Z offset value by 0.05 in order to get the number of shims needed. For example:   **Z offset = 0.34 mm** **0,34mm / 0,05mm  = 6,8 shims** **6,8 = 7 shims**   If the offset is **positive**, shims should be installed in the **right head** If the offset is **negative**, shims should be installed in the **left head**. To install the shims, follow the steps on [this video](https://support.bcn3d.com/hubfs/BCN3D%20Support/Omega%20media%20(images,%20videos,%20photos%20etc.)/Omega%20shim%20installation.mp4?hsLang=en).   Once the shims are installed you can run another Z calibration. 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