My printer went crazy

Bambu Lab A1 Series Bambu Lab A1 mini
1

I tried to print calibration tests on my a1 mini:
nr 1 - All in one calibration test by karel2003 - MakerWorld
nr 2 - Nano all-in-one 3D printer test Remixed by Fraoch - MakerWorld
nr 3 - 3-12cm bridge and 80° overhang test by Ealin - MakerWorld

On nr 1 and 2, the Z-axis went all the way up and the bed tried to kill me shooting forward with all speed. I thought: okaay maybe I didn’t change the printer for a1 mini in the settings in the Bambu Studio. Generated the g-code again for nr 1 and 2 and still had the same issue. Okay then.
Went to nr 3 and seemed to work. Until the autoleveling started. The print head moved very fast and nozzle started hitting the bed so hard it scratched the plate.

Just before I sliced those tests I updated Bambu Studio to 1.9.5.51.

What might be the problem? The slicer update? Or those tests need to have specified profile? Which I don’t think so, because it’s just priting a model? Or the tests have hidden settings that have to be tuned to specific printer?

2

You talk about gcode, are you putting files on the sdcard manually and printing from the SD card or from Bambu Studio (BS) or from Bambu Handy (BH)?

I am a little confused as it appears you are saying you were able to create a gcode with the wrong target printer, this would rule out BS or BH.

Can you provide a step-by-step of what you did for clarity.

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3

Why would it rule Bambu Studio out? I choose printer manually and with loading different projects A1 mini isn’t always set as default in them.
In this case I went to slice in BS test 1 and 2 again, making sure I have mini chosen and the results were the same - Z-axis on max height, and bed trying to home in waay over the limit.

My steps:

  1. open Bambu Studio
  2. load project/import stl file
  3. make sure a1 mini is chosen, pei plate and generic PLA filament profile
  4. slice
  5. save as g-code
  6. put file with g-code on SD card in models folder
  7. put SD card in printer
  8. turn printer on and start printing the file (no way to mistake files, as I name each differently)
  9. crazy printer

Before I updated Bambu Studio I didn’t have any problems that weren’t my own mistakes.
I use Bambu Studio on computer and I use card reader to load project into SD card. I don’t use and plan to use Bambu Handy anytime soon and I don’t plan to link Bambu Studio/Handy to the printer in network.

4

It rules out you using BS or BH to send to the printer directly as neither can send a different printer’s instructions to the wrong printer.

That doesn’t mean it can’t screw up. It just means when you said previously you had chosen the correct printer, it ruled out you sending the instructions directly from the BS or BH apps, you must have been using an SD card which you have since confirmed.

Does it perform correctly (not try to kill you) if you send directly from BS and not use and SD Card to transfer the data?

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5

I don’t use direct connection, nor I have desire set up one.
However, I did the calibration (in the printer menu maintenance → calibration) just in case and picked something else to print. Sliced the model in the Bambu Studio 1.9.5.51, transfered g-code file to SD card and ran the print.
After calibration printhead was close to the bed, and when I started the print z-axis wanted to go below the bed-line. So yes, I’m sure something in Bambu Studio is wrong.

Downgraded to Bambu Studio 01.09.03.50 and the print goes okay.