--- title: How to Replace the Hotend Flat Cable (Epsilon Series) description: The flat cables connected to the print heads are in constant movement and with time it is possible that they'll need replacement because of the wear damage. --- [Skip to content](https://support.bcn3d.com/knowledge/replace-hotend-flat-cable-epsilon-series#main-content) - [English](https://support.bcn3d.com/knowledge/replace-hotend-flat-cable-epsilon-series) - [Español](https://support.bcn3d.com/es/knowledge/replace-hotend-flat-cable-epsilon-series) 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](https://support.bcn3d.com/knowledge/replace-hotend-flat-cable-epsilon-series) - [Español](https://support.bcn3d.com/es/knowledge/replace-hotend-flat-cable-epsilon-series) 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. 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[Troubleshooting](https://support.bcn3d.com/knowledge/epsilon-series?hsLang=en#troubleshooting) # How to Replace the Hotend Flat Cable (Epsilon Series) ## The flat cables connected to the print heads are in constant movement and with time it is possible that they'll need replacement because of the wear damage.   --- | | [**EN**](https://support.bcn3d.com/knowledge/replace-hotend-flat-cable-epsilon-series) | [**ES**](https://support.bcn3d.com/es/knowledge/replace-hotend-flat-cable-epsilon-series?hsLang=en) | | --- | --- | --- | ---   | **Tools** | | | --- | --- | | ![allen-2-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/allen-2-icon.png?width=16&name=allen-2-icon.png) | > Allen Key 2mm | | ![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 | ---   **![warning-2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Contact%20form/warning-2.png?width=20&name=warning-2.png) This is an advanced repair article.** This guide is designed to be performed with the authorization and assistance of the BCN3D support team or authorized distributors. **Without the necessary knowledge, you could cause damage to the printer during repair and invalidate the warranty.** If you have any questions or problems please contact the support team: **[contact form](https://support.bcn3d.com/es/knowledge/kb-tickets/new?hsLang=en)**.   If you have checked the cables and found that they are damaged, this article will help you understand how to replace them: #### **1.** Raise the printing surface to the top (*Utilities/Maintenance/Move printing Platform)* ![Move printing platform](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Sigma-Sigmax%20R19/LCD%20Screenshots/Utilities/Maintenance/Move%20printing%20platform.png?width=360&name=Move%20printing%20platform.png) #### **2.** Turn off and unplug the printer. | ![bcn3d-epsilon-turn-off-1](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/General/bcn3d-epsilon-turn-off-1.png?width=387&name=bcn3d-epsilon-turn-off-1.png) | ![sigmax-turn-off-2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Sigma-Sigmax%20R19/Apagar%20impresora/sigmax-turn-off-2.png?width=459&name=sigmax-turn-off-2.png) | | --- | --- |   | ![bcn3d-electrical-hazard-02](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Safety%20guide/bcn3d-electrical-hazard-02.png?width=70&name=bcn3d-electrical-hazard-02.png) | **Attention!** **Electrical Hazard** **it's very important to** **turn off and disconnect the printer** to avoid short circuits or any risk of electrocution. | | --- | --- | | **Do not touch the power supply or the power supply's terminals during this repair.** | | #### **3.** Remove the Z cable cover and the inner cover. You can get more information about this step in the following articles: [How to remove the Z cable cover (Epsilon Series)](https://support.bcn3d.com/knowledge/remove-z-cable-cover-bcn3d-epsilon-series?hsLang=en) [How to remove the inner cover (Epsilon Series)](https://support.bcn3d.com/knowledge/remove-inner-cover-bcn3d-epsilon-series?hsLang=en) | ![z-cable-cover](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Epsilon/Remove%20z%20cable%20cover/z-cable-cover.png?width=688&name=z-cable-cover.png) | ![inner-cover-1](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Epsilon/Remove%20inner%20cover/inner-cover-1.png?width=688&name=inner-cover-1.png) | | --- | --- | | #### **4.** Remove the connection cover and disconnect the flat cable from the extruder board | ![screw-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/screw-icon.png?width=18&name=screw-icon.png)**x2 M3 8mm** | | --- | --- | ![ffc-extruder-board-epsilon](https://support.bcn3d.com/hs-fs/hubfs/ffc-extruder-board-epsilon.png?width=688&name=ffc-extruder-board-epsilon.png) - **Warning!** Be careful when handling the connection cover as the cables underneath may be damaged. If the last 4 digits of your printer serial number are **higher than 0771 for Epsilon W50** or **0498 for Epsilon W27**, you should consider the following: - **Warning!** The piezo cable is extremely sensitive, use caution when handling it. ![cable-piezo-1](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Sigma-Sigmax%20R19/Extruder%20board/cable-piezo-1.png?width=688&name=cable-piezo-1.png) #### **5.** Disconnect the flat cable from the mainboard. ![flat-cable-connecion-bcn3d](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/General/flat-cable-connecion-bcn3d.png?width=688&name=flat-cable-connecion-bcn3d.png) - **If the mainboard has flat cable clamps**, you will need to untighten the screws that close the clamp of the H flat cable in order to remove it, as shown in the example below (the cable in the example doesn't correspond to the directions): ![mainboard-flat-cable-clamps](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/drivers/mainboard-flat-cable-clamps.png?width=688&name=mainboard-flat-cable-clamps.png) #### **6.** Remove the ribbon cable from the printer and insert the new one by inserting it through the tacks. ![flat cable clamps epsilon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/flat%20cable%20clamps%20epsilon.jpg?width=688&name=flat%20cable%20clamps%20epsilon.jpg) - **Note:** This cable should be positioned behind all other flat cables #### **7.** Connect the ends of the flat cable to the extruder board and the mainboard. #### **8. Check the flat cable connections.** It is extremely important once the change is made, to [check that all the flat cables are correctly connected](https://support.bcn3d.com/knowledge/flat-cable-connections-bcn3d-epsilon-series?hsLang=en), during the process they are very likely to come loose from their position.    | **Parts** | | Buy these parts | | --- | --- | --- | | ![flat cable](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/flat%20cable.jpg?width=100&name=flat%20cable.jpg) | Flat cable Left Hotend - Epsilon W50 FFC H0 | [SKU 16005](https://www.bcn3d.com/product/ffc-flexible-flat-cable-w50/) | | ![flat cable](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/flat%20cable.jpg?width=100&name=flat%20cable.jpg) | Flat cable Right Hotend - Epsilon W50 FFC H1 | [SKU 16006](https://www.bcn3d.com/product/ffc-flexible-flat-cable-w50/) | | ![flat cable](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/flat%20cable.jpg?width=100&name=flat%20cable.jpg) | Flat cable Left Hotend - Epsilon W27 FFC H0 | [SKU 16514](https://www.bcn3d.com/product/ffc-flexible-flat-cable-w27/) | | ![flat cable](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/flat%20cable.jpg?width=100&name=flat%20cable.jpg) | Flat cable Right Hotend - Epsilon W27 FFC H1 | [SKU 16516](https://www.bcn3d.com/product/ffc-flexible-flat-cable-w27/) |   | **Send us your comments about this article** | [![feedback-button](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Button/feedback-button.png?width=179&name=feedback-button.png)](https://share.hsforms.com/1F7t1sBuOQyWlAeRwwFSjgQ3fec5) | | --- | --- | | **RELATED ARTICLES** | | | [![calibrate printing surface eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/calibrate%20printing%20surface%20eng.png?width=336&name=calibrate%20printing%20surface%20eng.png)](https://support.bcn3d.com/knowledge/printing-surface-calibration-bcn3d-epsilon-series?hsLang=en) | [![calibrate hotend eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/calibrate%20hotend%20eng.png?width=336&name=calibrate%20hotend%20eng.png)](https://support.bcn3d.com/knowledge/hotend-calibration-bcn3d-epsilon-series?hsLang=en) |   - 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