[GH-ISSUE #559 ] [Bug]: Cannot connect Bambu Studio to Virtual Printer (follow-up for #557 ) #366

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@maziggy commented on GitHub (Mar 1, 2026):

BambuStudio or Orcaslicer?

@maziggy commented on GitHub (Mar 1, 2026): BambuStudio or Orcaslicer?

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Wait....think i've found the problem. Give me some time to investigate it carefully.

@maziggy commented on GitHub (Mar 1, 2026): Wait....think i've found the problem. Give me some time to investigate it carefully.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Please try again with branch 0.2.2b1 and let me know how it goes.

@maziggy commented on GitHub (Mar 1, 2026): Please try again with branch 0.2.2b1 and let me know how it goes.

BreizhHardware commented

bambuddy-support-20260301-104818.zip

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@SyFizz commented on GitHub (Mar 1, 2026):

Hello,

I completely deleted my installation and launched a new one from source with the beta branch you specified.
I did :

git clone https://github.com/maziggy/bambuddy.git --branch 0.2.2b1
docker compose up -d --build

I then added one of my printers, and a virtual printer.
I edited the settings, toggled it off then on.

I still have the same issue.

Here's the support package :

Here's my VP settings :

And here's the error in Bambu Studio (and tested in Orca, i have the same error)

note: I also imported the new CA certificate in printers.cer

@SyFizz commented on GitHub (Mar 1, 2026): Hello, I completely deleted my installation and launched a new one from source with the beta branch you specified. I did : ``` git clone https://github.com/maziggy/bambuddy.git --branch 0.2.2b1 docker compose up -d --build ``` <img width="174" height="64" alt="Image" src="https://github.com/user-attachments/assets/8b043fe3-5bf6-45eb-a7c2-8ffb4beefe05" /> I then added one of my printers, and a virtual printer. I edited the settings, toggled it off then on. I still have the same issue. Here's the support package : [bambuddy-support-20260301-104818.zip](https://github.com/user-attachments/files/25659253/bambuddy-support-20260301-104818.zip) Here's my VP settings : <img width="1039" height="747" alt="Image" src="https://github.com/user-attachments/assets/fdc878e0-0067-41ae-9e2b-ce3dbff756a0" /> And here's the error in Bambu Studio (and tested in Orca, i have the same error) <img width="483" height="625" alt="Image" src="https://github.com/user-attachments/assets/79c196ee-727d-453a-8de3-28ebd5918ddf" /> note: I also imported the new CA certificate in printers.cer

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Debug logs don't have all relevent infos.

Disable virtual printer
Enable debug logging
Enable virtual printer
Try to connect via slicer multiple times
Donwload support bundle

@maziggy commented on GitHub (Mar 1, 2026): Debug logs don't have all relevent infos. 1. Disable virtual printer 2. Enable debug logging 3. Enable virtual printer 4. Try to connect via slicer multiple times 5. Donwload support bundle

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Oh yes...and a tcpdump while trying to connect would also be very helpful.

@maziggy commented on GitHub (Mar 1, 2026): Oh yes...and a tcpdump while trying to connect would also be very helpful.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

So your VP is now in Queue mode. What access code do you use? The one configured in Bambuddy, or the one from the printer?

@maziggy commented on GitHub (Mar 1, 2026): So your VP is now in Queue mode. What access code do you use? The one configured in Bambuddy, or the one from the printer?

BreizhHardware commented

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@SyFizz commented on GitHub (Mar 1, 2026):

Debug logs don't have all relevent infos.

Disable virtual printer

Enable debug logging

Enable virtual printer

Try to connect via slicer multiple times

Donwload support bundle

Here's the support bundle generated by these steps :
bambuddy-support-20260301-113434.zip

Oh yes...and a tcpdump while trying to connect would also be very helpful.

Could you tell me the command to run ? I don't know tcpdump well
My server is 192.168.0.10, VP on 192.168.0.201, and my computer is 192.168.0.54

So your VP is now in Queue mode. What access code do you use? The one configured in Bambuddy, or the one from the printer?

I use the access code configured in Bambuddy (12345678)
Since you asked, i also just tried with the access code from the printer, and it doesn't work better.

Maybe if you like we could debug on call with a screen sharing or something like that ?
Also sorry for my english, it's not my native language, i'm french

@SyFizz commented on GitHub (Mar 1, 2026): > Debug logs don't have all relevent infos. > > 1. Disable virtual printer > 2. Enable debug logging > 3. Enable virtual printer > 4. Try to connect via slicer multiple times > 5. Donwload support bundle Here's the support bundle generated by these steps : [bambuddy-support-20260301-113434.zip](https://github.com/user-attachments/files/25659510/bambuddy-support-20260301-113434.zip) > Oh yes...and a tcpdump while trying to connect would also be very helpful. Could you tell me the command to run ? I don't know tcpdump well My server is 192.168.0.10, VP on 192.168.0.201, and my computer is 192.168.0.54 > So your VP is now in Queue mode. What access code do you use? The one configured in Bambuddy, or the one from the printer? I use the access code configured in Bambuddy (12345678) Since you asked, i also just tried with the access code from the printer, and it doesn't work better. Maybe if you like we could debug on call with a screen sharing or something like that ? Also sorry for my english, it's not my native language, i'm french

BreizhHardware commented

https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging

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@maziggy commented on GitHub (Mar 1, 2026):

These are no debug logs. You need to enable debug mode!

@maziggy commented on GitHub (Mar 1, 2026): These are no debug logs. You need to enable debug mode! https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

sudo tcpdump -i any host 192.168.0.201 or port 1990 -nn -w /tmp/vp_debug.pcap

@maziggy commented on GitHub (Mar 1, 2026): sudo tcpdump -i any host 192.168.0.201 or port 1990 -nn -w /tmp/vp_debug.pcap

BreizhHardware commented

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@SyFizz commented on GitHub (Mar 1, 2026):

These are no debug logs. You need to enable debug mode!

https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging

Debug mode IS enabled...
In the logs you can see 2026-03-01 11:33:21,499 INFO [backend.app.api.routes.support] Log level changed to DEBUG and then just after, you can see when I enabled the VP again : 2026-03-01 11:33:26,983 DEBUG [backend.app.api.routes.virtual_printers] Update VP 1: body={'enabled': True}, current state: mode=print_queue, enabled=False, access_code_set=True, bind_ip=[IP]01, target=1

There's debug lines like 2026-03-01 11:34:02,358 DEBUG [backend.app.services.virtual_printer.bind_server] Bind server: client [IP]:50860 disconnected

For the tcpdump, here you go :
vp_debug.pcap.txt
GitHub refuses .pcap extensions, so you need to change remove the trailing .txt at the end :)

@SyFizz commented on GitHub (Mar 1, 2026): > These are no debug logs. You need to enable debug mode! > > https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging Debug mode **IS** enabled... In the logs you can see `2026-03-01 11:33:21,499 INFO [backend.app.api.routes.support] Log level changed to DEBUG` and then just after, you can see when I enabled the VP again : `2026-03-01 11:33:26,983 DEBUG [backend.app.api.routes.virtual_printers] Update VP 1: body={'enabled': True}, current state: mode=print_queue, enabled=False, access_code_set=True, bind_ip=[IP]01, target=1` There's debug lines like `2026-03-01 11:34:02,358 DEBUG [backend.app.services.virtual_printer.bind_server] Bind server: client [IP]:50860 disconnected` For the tcpdump, here you go : [vp_debug.pcap.txt](https://github.com/user-attachments/files/25659754/vp_debug.pcap.txt) GitHub refuses .pcap extensions, so you need to change remove the trailing .txt at the end :)

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

OK....never saw that before, but it looks like the A1 Mini is using different TLS settings for the handshake. Weird.

Anyway....updated branch 0.2.2b1. Please try again.

@maziggy commented on GitHub (Mar 1, 2026): OK....never saw that before, but it looks like the A1 Mini is using different TLS settings for the handshake. Weird. Anyway....updated branch 0.2.2b1. Please try again.

BreizhHardware commented

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@SyFizz commented on GitHub (Mar 1, 2026):

It works !!

Thanks you a lot for your help, you and your project are awesome.

@SyFizz commented on GitHub (Mar 1, 2026): It works !! Thanks you a lot for your help, you and your project are awesome.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Glad it works for you now :)

If you find Bambuddy useful, please consider giving it a ⭐ on GitHub — it helps others discover the project!

@maziggy commented on GitHub (Mar 1, 2026): Glad it works for you now :) ----- If you find Bambuddy useful, please consider giving it a ⭐ on [GitHub](https://github.com/bambuman/bambuddy) — it helps others discover the project!

BreizhHardware commented

bambuddy-support-20260301-193831.zip

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@S3LL1G28 commented on GitHub (Mar 1, 2026):

I have a H2s and got problem of connection

I have followed your instruction on the wiki for taking ca crt to printer.cer.

I'm now in the last version 0.2.2b1.

It's better my H2S virtual in proxy mode can be seen but i got a connection error.

I do this on appimage:

i rsync the cert:

rsync -aP bambuddy/virtual_printer/certs/bbl_ca.crt sellig@10.10.1.x:/xx/xxx

cd bambu-appimage/

./bambustudio.appimage --appimage-extract

find squashfs-root -name "printer.cer"

cat ../../bbl_ca.crt >> squashfs-root/resources/cert/printer.cer

./squashfs-root/AppRun

@S3LL1G28 commented on GitHub (Mar 1, 2026): I have a H2s and got problem of connection <img width="1326" height="1025" alt="Image" src="https://github.com/user-attachments/assets/58b3f721-3491-470c-a480-da7effb3d97b" /> I have followed your instruction on the wiki for taking ca crt to printer.cer. I'm now in the last version 0.2.2b1. It's better my H2S virtual in proxy mode can be seen but i got a connection error. [bambuddy-support-20260301-193831.zip](https://github.com/user-attachments/files/25664639/bambuddy-support-20260301-193831.zip) I do this on appimage: i rsync the cert: ``` rsync -aP bambuddy/virtual_printer/certs/bbl_ca.crt sellig@10.10.1.x:/xx/xxx ``` ``` cd bambu-appimage/ ./bambustudio.appimage --appimage-extract find squashfs-root -name "printer.cer" cat ../../bbl_ca.crt >> squashfs-root/resources/cert/printer.cer ./squashfs-root/AppRun ```

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

iptables rules are there?

@maziggy commented on GitHub (Mar 1, 2026): iptables rules are there?

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 1, 2026):

yes master ;)

 iptables -L -n -t nat
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
REDIRECT   6    --  0.0.0.0/0            0.0.0.0/0            tcp dpt:990 redir ports 9990
DOCKER     0    --  0.0.0.0/0            0.0.0.0/0            ADDRTYPE match dst-type LOCAL

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
REDIRECT   6    --  0.0.0.0/0            0.0.0.0/0            tcp dpt:990 redir ports 9990
DOCKER     0    --  0.0.0.0/0           !127.0.0.0/8          ADDRTYPE match dst-type LOCAL

@S3LL1G28 commented on GitHub (Mar 1, 2026): yes master ;) ``` iptables -L -n -t nat Chain PREROUTING (policy ACCEPT) target prot opt source destination REDIRECT 6 -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:990 redir ports 9990 DOCKER 0 -- 0.0.0.0/0 0.0.0.0/0 ADDRTYPE match dst-type LOCAL Chain INPUT (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination REDIRECT 6 -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:990 redir ports 9990 DOCKER 0 -- 0.0.0.0/0 !127.0.0.0/8 ADDRTYPE match dst-type LOCAL ```

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Nope, not sufficient. Please check the docs.

@maziggy commented on GitHub (Mar 1, 2026): Nope, not sufficient. Please check the docs.

BreizhHardware commented

https://wiki.bambuddy.cool/features/virtual-printer/

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@S3LL1G28 commented on GitHub (Mar 1, 2026):

i check the wiki and don't find more iptables rules to apply

LISTEN     0      100      10.10.1.225:8883         0.0.0.0:*     users:(("uvicorn",pid=6885,fd=24))                   
LISTEN     0      100      10.10.1.225:3002         0.0.0.0:*     users:(("uvicorn",pid=6885,fd=26))                   
LISTEN     0      100      10.10.1.225:3000         0.0.0.0:*     users:(("uvicorn",pid=6885,fd=25))                   
LISTEN     0      100      10.10.1.225:990          0.0.0.0:*     users:(("uvicorn",pid=6885,fd=23))

@S3LL1G28 commented on GitHub (Mar 1, 2026): i check the wiki and don't find more iptables rules to apply https://wiki.bambuddy.cool/features/virtual-printer/ ``` LISTEN 0 100 10.10.1.225:8883 0.0.0.0:* users:(("uvicorn",pid=6885,fd=24)) LISTEN 0 100 10.10.1.225:3002 0.0.0.0:* users:(("uvicorn",pid=6885,fd=26)) LISTEN 0 100 10.10.1.225:3000 0.0.0.0:* users:(("uvicorn",pid=6885,fd=25)) LISTEN 0 100 10.10.1.225:990 0.0.0.0:* users:(("uvicorn",pid=6885,fd=23)) ```

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Do you re-installed Bambuddy?

@maziggy commented on GitHub (Mar 1, 2026): Do you re-installed Bambuddy? <img width="814" height="271" alt="Image" src="https://github.com/user-attachments/assets/47a12a85-3f50-448a-9a07-d5cece0f1217" />

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 1, 2026):

yes i do it even if i do a restore

@S3LL1G28 commented on GitHub (Mar 1, 2026): yes i do it even if i do a restore

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Damn. Show me a screenshot of your VP settings.

@maziggy commented on GitHub (Mar 1, 2026): Damn. Show me a screenshot of your VP settings.

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 1, 2026):

sorry to disturb you :(

@S3LL1G28 commented on GitHub (Mar 1, 2026): sorry to disturb you :( <img width="629" height="886" alt="Image" src="https://github.com/user-attachments/assets/eda511f2-777a-4ad7-bdc9-f1de47c06b5b" />

BreizhHardware commented

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@maziggy commented on GitHub (Mar 1, 2026):

Why do you set Network Interface Override? That's wrong. Set it to default.

How do you connect via slicer? What IP address and what access code?

@maziggy commented on GitHub (Mar 1, 2026): Why do you set Network Interface Override? That's wrong. Set it to default. How do you connect via slicer? What IP address and what access code?

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 1, 2026):

Ok i was thinking it will be more secure for overide. I go back to default.

My lan i 10.10.1.0/24 my arch linux is 10.10.1.6 and my bambuddy is on 10.10.1.222 and 225 for VP.
The access code is the one from the printer and ip the one in 225 for VP

@S3LL1G28 commented on GitHub (Mar 1, 2026): Ok i was thinking it will be more secure for overide. I go back to default. My lan i 10.10.1.0/24 my arch linux is 10.10.1.6 and my bambuddy is on 10.10.1.222 and 225 for VP. The access code is the one from the printer and ip the one in 225 for VP

BreizhHardware commented

https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging

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@maziggy commented on GitHub (Mar 2, 2026):

please set

Bind Interface -> eth0 10.10.1.222
Network Interface Override -> default auto detect

Enable debug logging
Try to connect via slicer -> Bind with IP and access code -> use 10.10.1.222 and the access code from your printer's display
Download support package

@maziggy commented on GitHub (Mar 2, 2026): please set Bind Interface -> eth0 10.10.1.222 Network Interface Override -> default auto detect 1. Enable debug logging 2. Try to connect via slicer -> Bind with IP and access code -> use 10.10.1.222 and the access code from your printer's display 3. Download support package https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging

BreizhHardware commented

bambuddy-support-20260302-080439.zip

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@S3LL1G28 commented on GitHub (Mar 2, 2026):

Hi,

Ok I follow your instructions.

@S3LL1G28 commented on GitHub (Mar 2, 2026): Hi, Ok I follow your instructions. [bambuddy-support-20260302-080439.zip](https://github.com/user-attachments/files/25675890/bambuddy-support-20260302-080439.zip)

BreizhHardware commented

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@maziggy commented on GitHub (Mar 2, 2026):

So what is the current issue? I don't see any errors in log.

2026-03-02 08:03:32,529 INFO [backend.app.services.virtual_printer.tcp_proxy] Bind proxy: client connected from [IP]:59304

@maziggy commented on GitHub (Mar 2, 2026): So what is the current issue? I don't see any errors in log. >2026-03-02 08:03:32,529 INFO [backend.app.services.virtual_printer.tcp_proxy] Bind proxy: client connected from [IP]:59304

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 2, 2026):

The issue is i get an error connection in bambustudio.

What is strange it's the name of the printer not VP and sometimes i saw the VP name I put access code and same error.

The VP is seen sometimes and disappear after few seconds

@S3LL1G28 commented on GitHub (Mar 2, 2026): The issue is i get an error connection in bambustudio. <img width="1028" height="494" alt="Image" src="https://github.com/user-attachments/assets/1662f3c7-9caf-468a-9fcc-f90ade4528a2" /> What is strange it's the name of the printer not VP and sometimes i saw the VP name I put access code and same error. The VP is seen sometimes and disappear after few seconds

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 2, 2026):

@S3LL1G28 commented on GitHub (Mar 2, 2026): <img width="249" height="149" alt="Image" src="https://github.com/user-attachments/assets/d02d5e3c-b3e4-4afe-8e08-af6dfcbcd744" />

BreizhHardware commented

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@maziggy commented on GitHub (Mar 2, 2026):

According to your logs, the proxy is running prooperly without errors. I also see the incoming and established(!) connection from your slicer, but it never sends anything to the printer.

Show me screenshots of:

the virtual printer settings
your slicer window -> device tab -> opened connection list, so that i can see connected and discovered printers

@maziggy commented on GitHub (Mar 2, 2026): According to your logs, the proxy is running prooperly without errors. I also see the incoming and established(!) connection from your slicer, but it never sends anything to the printer. Show me screenshots of: 1. the virtual printer settings 2. your slicer window -> device tab -> opened connection list, so that i can see connected and discovered printers

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 2, 2026):

I'm not sure to understand device tag.

@S3LL1G28 commented on GitHub (Mar 2, 2026): <img width="556" height="728" alt="Image" src="https://github.com/user-attachments/assets/1c900a0d-f281-4527-a5f1-3afe351068e5" /> I'm not sure to understand device tag. <img width="1687" height="817" alt="Image" src="https://github.com/user-attachments/assets/93b692df-4d54-4bcc-a371-c0c8f84866e2" /> <img width="1687" height="882" alt="Image" src="https://github.com/user-attachments/assets/d453c6b1-81d4-4d92-a093-8b4cb628d115" />

BreizhHardware commented

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@maziggy commented on GitHub (Mar 2, 2026):

Your are not connecting via the proxy, but directly to the printer! When establishing a connection to the proxy it should show the printer name "<printer name> (Proxy)".

I guess you are testing the VP proxy, although your desk computer, Bambuddy and the printer are all connected to the same LAN. That can be problematic with Bambu Studio, because it "sees" the printer with multiple IP addresses.

@maziggy commented on GitHub (Mar 2, 2026): Your are not connecting via the proxy, but directly to the printer! When establishing a connection to the proxy it should show the printer name `"<printer name> (Proxy)"`. I guess you are testing the VP proxy, although your desk computer, Bambuddy and the printer are all connected to the same LAN. That can be problematic with Bambu Studio, because it "sees" the printer with multiple IP addresses.

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 2, 2026):

yes i understand that i''m connected directly. Yes i'm interesting using proxy mode. But in your wiki you ask to be on the same lan.

What is strange i saw briefly my vp on device in bambustudio and it disappear and what is strange is they don't have the same ip. So normally no pb, no conflicts. even if i enter by hand the vp ip I saw the name of the printer in bambustudio

@S3LL1G28 commented on GitHub (Mar 2, 2026): yes i understand that i''m connected directly. Yes i'm interesting using proxy mode. But in your wiki you ask to be on the same lan. What is strange i saw briefly my vp on device in bambustudio and it disappear and what is strange is they don't have the same ip. So normally no pb, no conflicts. even if i enter by hand the vp ip I saw the name of the printer in bambustudio

BreizhHardware commented

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@S3LL1G28 commented on GitHub (Mar 2, 2026):

so let's go to basic. I never connect my printer in local mode. I first do in clolud mode.

To be sure how to connect in lan mode ? I must connect with bind with accesscode ?

I suspect appimage now, i have windows 11 too i will test and tell you

@S3LL1G28 commented on GitHub (Mar 2, 2026): so let's go to basic. I never connect my printer in local mode. I first do in clolud mode. To be sure how to connect in lan mode ? I must connect with bind with accesscode ? I suspect appimage now, i have windows 11 too i will test and tell you

BreizhHardware commented

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@maziggy commented on GitHub (Mar 2, 2026):

Your desk computer which is running the slicer is also on the same LAN and therefore also discovers the printer directly via SSDP. This is something the slicer doesn't like. Furthermore it doesn't makes sense to use the proxy when connected to the same LAN.

@maziggy commented on GitHub (Mar 2, 2026): Your desk computer which is running the slicer is also on the same LAN and therefore also discovers the printer directly via SSDP. This is something the slicer doesn't like. Furthermore it doesn't makes sense to use the proxy when connected to the same LAN.

BreizhHardware commented

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@maziggy commented on GitHub (Mar 2, 2026):

To connect via LAN mode to your printer, you need to disable the Proxy. The slicer will auto discover your printer.

@maziggy commented on GitHub (Mar 2, 2026): To connect via LAN mode to your printer, you need to disable the Proxy. The slicer will auto discover your printer.

BreizhHardware commented