--- title: How to change the cable of the hotend description:   EN ES    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. 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[3D printer](https://support.bcn3d.com/knowledge/tips?hsLang=en#3d-printer) # How to change the cable of the hotend   --- |   | [**EN**](https://support.bcn3d.com/knowledge/change-hotend-cable) | [**ES**](https://support.bcn3d.com/es/knowledge/change-hotend-cable?hsLang=en) | | --- | --- | --- | ---   **![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)**.   **Do not disassemble the hotend during this process**, only is necessary to change the cable. Any other modification in the hotend could produce issues during the printing. | **Tools** |   | | --- | --- | | ![allen-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/allen-icon.png?width=21&name=allen-icon.png) | > Allen key 1.5mm | | ![wire-metal-brush-2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/wire-metal-brush-2.png?width=71&name=wire-metal-brush-2.png) | > Metal brush | --- #### **1.** Check that the heating block and the screws that hold the resistor and the thermistors are clean. ![hotend limpio Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/hotend%20limpio%20Cropped.jpg?width=688&name=hotend%20limpio%20Cropped.jpg) If not, use the hotend cleaning assistant (*Utilities, Maintenance, clean hotend*) and remove any excess dirt. | ![bcn3d-epsilon-maintenance](https://support.bcn3d.com/hs-fs/hubfs/image-png-Aug-13-2020-10-59-14-87-AM.png?width=360&name=image-png-Aug-13-2020-10-59-14-87-AM.png) | ![bcn3d-epsilon-hotend-cleaning-assitant](https://support.bcn3d.com/hs-fs/hubfs/image-png-Aug-13-2020-11-42-20-92-AM.png?width=335&name=image-png-Aug-13-2020-11-42-20-92-AM.png) | | --- | --- | #### **2. **Let the hotend cooldown. Check from the temperatures menu that the hotend is at room temperature.  ![bcn3d-epsilon-tempèratures](https://support.bcn3d.com/hs-fs/hubfs/image-png-Aug-13-2020-10-31-37-65-AM.png?width=420&name=image-png-Aug-13-2020-10-31-37-65-AM.png) #### **3.** 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) | ![epsilon-turn-off-1](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Epsilon/Apagar%20impresora/epsilon-turn-off-1.png?width=459&name=epsilon-turn-off-1.png) | | --- | --- | | #### **4.** Unscrew and remove the connection cover. | ![screw-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/screw-icon.png?width=18&name=screw-icon.png)**x2 M2x8mm** | | --- | --- | | ![cambio hotend1 Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend1%20Cropped.png?width=688&name=cambio%20hotend1%20Cropped.png) | ![cambio hotend Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend%20Cropped.png?width=688&name=cambio%20hotend%20Cropped.png) | | --- | --- | #### **5.** Disconnect the cable from the hotend. | ![cambio hotend2 Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend2%20Cropped.png?width=688&name=cambio%20hotend2%20Cropped.png) | ![cambio hotend3 Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend3%20Cropped.png?width=688&name=cambio%20hotend3%20Cropped.png) | | --- | --- | If the last 4 digits of your printer's serial number are **higher than 0771 for Epsilon W50**, **0498 for Epsilon W27, or 0381 for Sigma D25**, you should take the following into consideration: - **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) - Below is the placement of the connections of the main components  ![extruder-board-piezo-connections](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Sigma-Sigmax%20R19/Extruder%20board/Hotend.png?width=688&name=Hotend.png) | #### **6.** Remove the screws from the hotend. | ![screw-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/screw-icon.png?width=18&name=screw-icon.png)**x2 M3x6mm** | | --- | --- | ![cambio hotend4 Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend4%20Cropped.png?width=688&name=cambio%20hotend4%20Cropped.png) | #### **7.** Using the short side of the allen wrench, unscrew the set screws that hold the heating resistance and the thermistor.  |   ![screw-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/screw-icon.png?width=18&name=screw-icon.png)**x2 M1.5x6mm** | | --- | --- | ![unscrew\_hotend](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/unscrew_hotend.jpg?width=688&name=unscrew_hotend.jpg) - **Warning!** Do not apply too much force to avoid damaging the set screws. Do not remove the set screws from the heating block. - **Do not disassemble the hotend during this process**, only is necessary to remove the cable. Any other modification in the hotend could produce issues during the printing. #### **8.** Remove the cables from the hotend. #### **9. **Insert the new hotend cables and screw the set screws as shown below. ![screw\_resistance](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/screw_resistance.jpg?width=688&name=screw_resistance.jpg) - The **heating resistance must be centered in the hotend**, this way the heat transmission is correct. ![screw\_thermistor](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/screw_thermistor.jpg?width=688&name=screw_thermistor.jpg) - The **thermistor should be positioned** so that **its back is flush with the surface of the heating block**. ![thermistor\_position2](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/thermistor_position2.jpg?width=688&name=thermistor_position2.jpg) - **Warning!** Use the long side of the Allen wrench to tighten the set screw and don't apply too much force.  #### **10.** Connect the hotend to the extruder board. | ![cambio hotend3 Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend3%20Cropped.png?width=688&name=cambio%20hotend3%20Cropped.png) | ![cambio hotend2 Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend2%20Cropped.png?width=688&name=cambio%20hotend2%20Cropped.png) | | --- | --- | | #### **11.** Position the connection cover and screw. | ![screw-icon](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Tools/screw-icon.png?width=18&name=screw-icon.png)**x2 M2x8mm** | | --- | --- | | ![cambio hotend Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend%20Cropped.png?width=688&name=cambio%20hotend%20Cropped.png) | ![cambio hotend1 Cropped](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Draft/cambio%20hotend1%20Cropped.png?width=688&name=cambio%20hotend1%20Cropped.png) | | --- | --- | #### **12.** Perform an autotune of the hotends. (*Utilities, Maintenance, Autotune*) | ![bcn3d-epsilon-maintenance](https://support.bcn3d.com/hs-fs/hubfs/image-png-Aug-13-2020-10-59-14-87-AM.png?width=360&name=image-png-Aug-13-2020-10-59-14-87-AM.png) | ![bcn3d-epsilon-autotune](https://support.bcn3d.com/hs-fs/hubfs/image-png-Aug-13-2020-11-30-48-70-AM.png?width=335&name=image-png-Aug-13-2020-11-30-48-70-AM.png) | | --- | --- |   | **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** | | | [![replace hotend eng](https://support.bcn3d.com/hs-fs/hubfs/Knowledge%20base/Related%20Articles%20English/replace%20hotend%20eng.png?width=336&name=replace%20hotend%20eng.png)](https://support.bcn3d.com/knowledge/change-hotend-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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