# BTT Manta V2 + CB1 **URL:** \ **Category:** General Discussion\ **Created:** [July 16, 2024, 5:24pm UTC](https://klipper.discourse.group/t/btt-manta-v2-cb1/17700 "2024-07-16T17:24:46Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![zacf](https://avatars.discourse-cdn.com/v4/letter/z/3d9bf3/32.png) [@zacf](https://klipper.discourse.group/u/zacf)\ **Post date:** [July 16, 2024, 5:24pm UTC](https://klipper.discourse.group/t/btt-manta-v2-cb1/17700/1 "2024-07-16T17:24:46Z")
### Basic Information: Printer Model: Homebrewed 🙂 MCU / Printerboard: Mant m8p V2 Host / SBC: CB1 [octoprint-systeminfo-20240716161603.zip](https://klipper.discourse.group/uploads/short-url/fld1SQT9JsW7bhXoR35v6mKChoi.zip) (44.2 KB) [klippy.log](https://klipper.discourse.group/uploads/short-url/tI3eszEDm9f0xau9foScWwBqgAT.log) (1.2 MB) klippy.log Hi, Got a new brain for my printer after an accident… Manta m8p V2 with CB1. I Installed the minimal image for the CB1 and updated it (2.3.4 Bullseye with Linux 5.16.17-sun50iw9). Kilpper is unable to connect to the mcu. The terminal say: > Trying port /dev/ttyACM0, baudrate 115200 > Connecting to port /dev/ttyACM0, baudrate 115200 > Could not open port /dev/ttyACM0, baudrate 115200, skipping > Trying port /dev/ttyACM0, baudrate 250000 > Connecting to port /dev/ttyACM0, baudrate 250000 > Could not open port /dev/ttyACM0, baudrate 250000, skipping > … octoprint.log say: > 2024-07-16 16:02:30,447 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyACM0, baudrate 115200 > 2024-07-16 16:02:30,486 - octoprint.util.comm - INFO - Connecting to port /dev/ttyACM0, baudrate 115200 > 2024-07-16 16:02:30,592 - octoprint.util.comm - INFO - Failed to connect: Port /dev/ttyACM0 is busy or does not exist > 2024-07-16 16:02:30,593 - octoprint.util.comm - INFO - Serial detection: Could not open port /dev/ttyACM0, baudrate 115200, skipping > 2024-07-16 16:02:30,593 - octoprint.util.comm - INFO - Serial detection: Trying port /dev/ttyACM0, baudrate 250000 > 2024-07-16 16:02:30,596 - octoprint.util.comm - INFO - Connecting to port /dev/ttyACM0, baudrate 250000 Running **ls /dev/serial/by-id/** return the board: > /dev/serial/by-id/usb-Klipper\_stm32h723xx\_12345-if00 Running **dmesg -w** I get: > [3.585182] usb 2-1.4: New USB device found, idVendor=1d50, idProduct=614e, bcdDevice= 1.00 > [3.594652] usb 2-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [3.601987] usb 2-1.4: Product: stm32h723xx > [3.606185] usb 2-1.4: Manufacturer: Klipper > [3.610465] usb 2-1.4: SerialNumber: 12345 And: > [8.387797] cdc\_acm 2-1.4:1.0: ttyACM0: USB ACM device > [8.388507] usbcore: registered new interface driver cdc\_acm > [8.388528] cdc\_acm: USB Abstract Control Model driver for USB modems and ISDN adapters I don’t see anything else attached to ttyACM0. I also noticed this (not sure if it’s related): > [8.389819] cfg80211: Loading compiled-in X.509 certificates for regulatory database > [8.391187] cfg80211: Loaded X.509 cert ‘sforshee: 00b28ddf47aef9cea7’ > [8.466195] cfg80211: loaded regulatory.db is malformed or signature is missing/invalid I’ll appreciate any help. ---
**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:** [July 16, 2024, 6:25pm UTC](https://klipper.discourse.group/t/btt-manta-v2-cb1/17700/2 "2024-07-16T18:25:21Z")
Hello @zacf ! I seems you mix up the connection of Klipper to the MCU and the connection of OctoPrint to Klipper. As for the klippy.log, in the last sequence of the log, the connection from Klipper to the MCU is fine. Yo have to try a different port for the connection of OctoPrint to Klipper In OctoPrint Settings → Printer → Serial Connection. In **Additional serial ports** there may be a port `/tmp/printer` Choose that one to connect to Klipper. BTW: How did you install Klipper and OctoPrint to the CB1? If /temp/printer does not work, you may try `/home/pi/printer_data/comms/klippy.serial` but depending of your installation the path may be a bit different. This one you have to insert into that field I mentioned before. ---
**Author:** ![zacf](https://avatars.discourse-cdn.com/v4/letter/z/3d9bf3/32.png) [@zacf](https://klipper.discourse.group/u/zacf)\ **Post date:** [July 17, 2024, 1:04pm UTC](https://klipper.discourse.group/t/btt-manta-v2-cb1/17700/3 "2024-07-17T13:04:51Z")
> [@EddyMI3D](#): > > /home/pi/printer\_data/comms/klippy.serial Thanks for your reply. I installed Klipper and OctoPrint with Kiauh. I restored a backup of OctoPrint upon first login to it. Adding _/home/pi/printer\_data/comms/klippy.serial_ didn’t help. ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/b/b0be6c39c71deaa22f6ad248ec28ada33593872f.png) Is there a way to find the correct serial port? Thanks ---
**Author:** ![zacf](https://avatars.discourse-cdn.com/v4/letter/z/3d9bf3/32.png) [@zacf](https://klipper.discourse.group/u/zacf)\ **Post date:** [July 17, 2024, 1:22pm UTC](https://klipper.discourse.group/t/btt-manta-v2-cb1/17700/4 "2024-07-17T13:22:29Z")
Thanks @EddyMI3D. You’re a lifesaver. BIQU had to act like smart@$$… The root user for the CB1 image is BIQU and not pi. /home/ **biqu** /printer\_data/comms/klippy.serial did the trick. Thanks! ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [August 16, 2024, 11:22pm UTC](https://klipper.discourse.group/t/btt-manta-v2-cb1/17700/5 "2024-08-16T23:22:55Z")
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