BTT Octopus DFU not detected
Hi again everyone. Still working on my issues with the printer (wish I could go back a few weeks with it).
Got the Pi working and into the configurator. Selected my V-Core 3 400 and on to BTT Octopus V1.1
Need to upload firmware, so used the DFU option and did as asked. Bridged the two pins as shown and hit ruset button.
...
chamber thermistor saying -40
Hello all, I was wondering if there is a way of changing the resistance of this generic thermistor, I presume that's the issue anyway.
Ive attached a pic of the issue. I feel like I knew how to fix this on a previous config but for the life of me I cant remember how....

Raspberri Pi issue?
Hi everyone. Long time since I have posted - my printer has been nice and reliable for quite some time. I came to an issue over the weekend and think the Pi may be bricked?
It started on Friday when I sent a print to the V-Core through RatOS and it uploaded but reported back that the upload failed. At this point, I was getting active temperature measurements etc.
I looked in RatOS and found that I had a heap of updates to do, so started uploading them. When I went to update Klipper, it failed and since then have not been able to communicate to the printer.
Given the issues and chatting with a friend who also has a V-Core, I updated RatOS on the Pi. This initially failed and assumed maybe my memory card failed so got a new one and installed the boot loader.
Now, I can't seem to even get wireless up and running on the Pi and cannot connect via ethernet connection from Pi to Laptop either....
First layer squish (possible thermal expansion)
Hello, might be a bit over my head with this post.
Initial problem: in the last month(after the update to rc3)(previous last update in november 2024) I started to get inconsistent first layer where the print started perfect and as it progressed within the first layer it started to squish the filament up to the point where it almost got embedded in the pei plate. All this happened after a beacon
_ratos_calibrate after the update (rc3). Many hours later (48+ actual hours) of troubleshooting I have discovered a few things: 1.heatsoak helps (allow the bed to reach a stable point of expansion) but really inconvenient and clearly a problem with the last update since the software was able to compensate before for this.
2.Run beacon_ratos_calibrate with the heated at the usual printing temperature (my case 50 C) and got almost perfect layer for the last 8 prints (one first layer of 320x210mm)
3.(In my opinion unrelated to beacon, but still intresting) playing whit the tension screw on the extruder changes drasticly the consistency of the first layer (not going too tight or too loose -variance betwen a reasonable amount of force) the extruder is not at fault since I tried to recreate the "pattern" with 2 different extruders (LDO ORBITER 2.0 and LDO OBRITER 2.5)....
Reboot issue
Hello all, I don't think this is really a Ratos issue but I rebooted my Ratos and now it seems like it doesn't want to connect again. Nothing has changed, it's just decided it doesn't want to work any more and gives me this saying "refused to connect" am I missing something? Or is it fucked?
Cheers
J...

Slicer Support for Post-Processing
When will Orca 2.3.0 officially be supported in the Post-Processing plugin? I have currently bypassed post-processing in printer.cfg as I get an error when trying to print something that is sliced with Orca 2.3.0. I have a V-Core 3.1 single nozzle printer, so I assume the post-processing wasn't doing anything for my printer to begin with, so it's not a huge deal if the slicer is supported or not.
Klipper Screen load/unload IDEX
It seems like the unload macro on Klipper screen can’t be used because it’s not defined for IDEX printers.
The printhead is required to be specified but can’t be done on the screen.
I would suggest, that the homing procedure is required, and the active printhead should be the printhead which is selected on Klipper screen. This should lead to a working macro. If the homing is required must be discussed, but the active printhead should be taken from the selected one from the screen....

Loading Filament into Inactive Extruder Throws Move out of Range Error
Hey all,
I'm not sure if this is expected behaviour or not, but if I load filament into T0 or T1 without first making that the active extruder in the UI, then the extruder primes the nozzle where it is parked on the oozeguard (rather than moving to the purge position like it would if the extruder was active) and throws a move out of range error when it's done, putting the printer in a shutdown state.
Is there a way to make RatOS switch active extruders if filament insert is detected in the currently non-active extruder to avoid this?...
Need Help Adding Synchronized Secondary CoreXY System Inside VCore 3.1
Full Story
Hey everyone! I’m working on a super niche project and could really use your collective expertise. Imagine this: I’ve got a RatRig VCore 3.1-300 (which is amazing, by the way!), and I’m trying to integrate a smaller, custom CoreXY system inside its build volume. This secondary system uses the same CoreXY belt/pulley setup and routing as the VCore but has a smaller (250x250) area and no Z-axis—it’s purely for synchronized X/Y motion. Think of it like a "printer inside a printer" that needs to mirror the primary nozzle’s movements.
Hardware Setup
- BTT Octopus V1.1 F446 (Motor3/Motor4 unused, free endstop pins available and connected to PG10 and PG11)....

Update RatOs from 1.0
Hi, is it possible to upgrade a RatOs 1.0.0 to a recent version?
Sorry for this stupid Q, but it seems un-seachable in the forum.
Main reason for updating is the KlipperScreen "Python too old"...
I think the the RatOs documentation expects a newer version - or at least i have troubles following the guide....
...
Solution:
You have to flash the 2.1 RC image onto your SD card, you cannot update from 1.0.
Access password
I am trying to set a password to keep unauthorized users on the local network from being able to access the printer, and maybe I'm just being dense, but there doesn't seem to be an option for that. I searched the history here and nobody seems to have asked about it.
Vcore4 running latest ratos release....
VAOC Camera Error while connecting
Hello 🙂
I had my VAOC camera up and running and everthing worked like a dream....untill....
I tried to add a second webcam to view the chamber while printing, this also worked, got an image but lost the image of the VAOC cam.
I set everthing back to the original settings, so went back to the old settings in Crowsnest and now the VAOC camera will not work despite the fact that the Raspberry PI reckognizes the VAOC cam....

SSH Password
I 'm trying to log in on my network via SSH.
I put in user name pi with the ip address and when it ask for the password I used the default raspberry but it will not logon. I know I did not change the password so does this mean I have to reinstall from the beginning? Is there another way?...
VAOC move out of range. x-offset too high
Hello,
i have a strange new issue with the printer and i dont know why.
I have the console output attached as well as my printer.cfg
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moving the points for z-tilt
hello, i am currently searching for the z-tilt variables. However, i dont want to do something faulty here.
i guess the code in printer.cfg should be:
```[z_tilt]
points:
(point 1 x,y)...
Solution:
Ahhh thank you. That was what I was searching for. TBH it was 2 in one question. First of all if it is correct and 2nd how it is defined right now.
This is the config for the 500:
points:
30,30...
Out of Range Error T1
I keep getting out of range error on my VCore 4 500 IDEX on T1. It mostly happens when the print finishes but does happen during a print. Any idea on what is going on? If I only print on T0 I don't get the error.
extruder sensor transient zero problem
I had a very short duration bad reading from my extruder sensor, which caused a shutdown during a 2 day print.
It may be caused by loose wire, etc., but really I just want to filter out bad readings for now.
Its been suggested I use this:
[temperature_sensor]
type: temp_filter...

Error gcode_macro _START_VAOC:gcode
Hello everyone, I'm new and I recently purchased my first RatRig v core 4 500.
I apologize in advance if my problem is trivial but I don't know where to go to solve it. I followed the configuration steps from the manual but it continues to give me this error when I try to calibrate the VAOC:
Error evaluating 'gcode_macro _START_VAOC:gcode': jinja2.exceptions.UndefinedError: 'extras.gcode_macro.GetStatusWrapper object' has no attribute 'z_offset_probe'....

Expansion ports pins not being copied to RatOS.cfg using wizard (EXP1_1 etc)
In the wizard I selected btt-octopus-11. It has pin aliases defined for the Expansion ports but they where not copied by the wizard to RatOS.cfg. I had to manual add them to get Expansion ports working for my LCD screen.
BTT Octopus Pro v1.1 with BTT Pi v1.2.1, Getting 502 Bad Gateway error
Greetings All,
I have a SecKit CoreXY printer that I want to upgrade to use the RatRig ecosystem on a BTT Octopus Pro V1.1 (H723) and a BTT Pi V1.2.1. I'm using 32 GB SanDisk Ultra MicroSD HC1 in both boards. Everything is brand new and never used until now. (Also bought their accelerometer board.)
A friend of mine is running his Voron on the same boards and software, though I'm not sure what version of RatOS he began with....