# Unable to Home Z axis "no active tool probe" **URL:** \ **Category:** General Discussion\ **Created:** [June 26, 2024, 3:14pm UTC](https://klipper.discourse.group/t/unable-to-home-z-axis-no-active-tool-probe/17300 "2024-06-26T15:14:38Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![SpankySummers](https://avatars.discourse-cdn.com/v4/letter/s/2acd7d/32.png) [@SpankySummers](https://klipper.discourse.group/u/SpankySummers)\ **Post date:** [June 26, 2024, 3:14pm UTC](https://klipper.discourse.group/t/unable-to-home-z-axis-no-active-tool-probe/17300/1 "2024-06-26T15:14:38Z")
### Basic Information: Printer Model: Voron 2.4 MCU / Printerboard:BTT Manta M8P Host / SBC klippy.log _Fill out above information and_ **_in all cases attach your_ `klippy.log` _file_** (use zip to compress it, if too big). _Pasting your_ `printer.cfg` _is **not** needed_ _ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _ ### Describe your issue: Hello there, i rencently finished my Voron 2.4 and got it working. Next step is a toolchanger version as seen from creator “viesturz”, tapchanger and his github. I copied some of his code and also modified some, because with a pure copy i got some problems, i think becaus of modifications on his printer, that i dont have. But the issue now is, i cant home Z axis anymore, endstops-check also not possible. In my previous working Config i had a [probe] section with defined probe pin (optical sensor via EBB36 board) like this: [probe] pin: ^T0: PB9 etc… but now it says “Option ‘pin’ is not valid in section ‘probe’” there is now a section [toolprobe\_T0] and [toolprobe\_T1] (that i copied from viesturz config) but i guess i need to tell the system that probe is now within toolprobe\_T0. But nowhere in any file i can identifiy anything like this to include in my .cfg I hope u can understand the problem. Thank u for reading this and greetings, Niko [klippy (10).log](https://klipper.discourse.group/uploads/short-url/uLRYDCXM5pJGStyXLagiNrm3nQ1.log) (159.3 KB) ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [June 26, 2024, 3:55pm UTC](https://klipper.discourse.group/t/unable-to-home-z-axis-no-active-tool-probe/17300/2 "2024-06-26T15:55:04Z")
Hello @SpankySummers ! First, let’s get @Viesturz into the boat. You maybe have to tell Klipper what the active tool/probe is. [https://www.klipper3d.org/G-Codes.html#activate\_extruder](https://www.klipper3d.org/G-Codes.html#activate_extruder) We do that on IDEX printers. ---
**Author:** ![SpankySummers](https://avatars.discourse-cdn.com/v4/letter/s/2acd7d/32.png) [@SpankySummers](https://klipper.discourse.group/u/SpankySummers)\ **Post date:** [June 27, 2024, 11:55am UTC](https://klipper.discourse.group/t/unable-to-home-z-axis-no-active-tool-probe/17300/3 "2024-06-27T11:55:30Z")
Hi, thanks for your reply, the toolprobe was already active, that wasnt the issue. But your idea got me in the right direction and i got it solved. The active toolhead is identified via the NOT triggered z-endstop and since i only got one (didnt think i need endstops on the other tools) the active tool could not be determined. (no sensor on second toolhead made it look like not triggered also) i could make it work with shorting the pins on second toolhead, making it think it is triggered. another opto-tap is ordered. Thank you EddyMI3D for the input, if not already clear i have no programming background and am just tinkering around with code i see. Thats why i am very thankful of all the information out there from so many talented people that are also willing to share and help. I will mark this post as solved, since the missing probe is the issue. But im also pretty sure this wasn’t my last question 😉 Grettings, Niko ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [July 27, 2024, 9:56pm UTC](https://klipper.discourse.group/t/unable-to-home-z-axis-no-active-tool-probe/17300/4 "2024-07-27T21:56:00Z")
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