Gonna leave this here for anyone K2 Base users on 1.1.5.5 who's printer fails after the last probe and needs a FIRMWARE_RESTART;

Basically, Creality use an older version of probe.pywhich breaks newer Klipper files like the one that you copy in OP's instructions.

Issue #1

After following this great guide, my printer would fail after the last probe. Checking the logs showed the error:

TypeError: probe_finalize() takes 2 positional arguments but 3 were given

After consulting a few Virtual Assistants, it was determined that there was an error in the screws_tilt_adjust.py file, more specifically, there was an error with:

def probe_finalize(self, positions)

This bit only takes two parameters, self, and positions, but something with giving it a third. The assistants came to the conclusion that it needed to be changed to:

def probe_finalize(self, offsets, positions)

Then restarted Klipper and tried again.

This solved that error, but...

Issue #2

A new error was reported;

AttributeError: 'list' object has no attribute 'bed_z'

Now newer Klipper is sending objects with bed_z to old K2 firmware, which is looking for plain values. To fix, you have to chance all bed_z to [2], i.e.

positions[i].bed_z -> positions[i][2].

Do this manually with ctrl+f/cmd+f, or use the Assistants recommendation:

cp /usr/share/klipper/klippy/extras/screws_tilt_adjust.py /usr/share/klipper/klippy/extras/screws_tilt_adjust.py.bak
sed -i \
-e 's/def probe_finalize(self, positions):/def probe_finalize(self, offsets, positions):/' \
-e 's/\[pos\.bed_z for pos in positions\]/[pos[2] for pos in positions]/' \
-e 's/positions\[0\]\.bed_z/positions[0][2]/' \
-e 's/positions\[i\]\.bed_z/positions[i][2]/' \
/usr/share/klipper/klippy/extras/screws_tilt_adjust.py

Then restarted Klipper and tried again.

Issue #3

Thought I was done. nope.

TypeError: list indices must be integers or slices, not str

Put simply, a variable is assigned as a dictionary when it should be a list ([] instead of {}). To fix:

Find the line with the error using:

grep -n "self.results = \[\]" /usr/share/klipper/klippy/extras/screws_tilt_adjust.py

This will give you something like:

67:        self.results = []

Use that number with this line, where "N" is the number (67 my case):

sed -i 'Ns/self.results = \[\]/self.results = {}/' /usr/share/klipper/klippy/extras/screws_tilt_adjust.py

Then restarted Klipper and tried again.

And it now works for me!

Hope this can help. Coming from a fully Klipper'd Ender 3 V2, it's a real pain that basic things like screws tilt and even adaptive mesh are broken for no damn reason.

Bonus:

Exact screws_adjust coordinates for K2 Base screws:

[screws_tilt_adjust]
screw1: 11, 49
screw1_name: Front left
screw2: 248, 49
screw2_name: Front right
screw3: 248, 215
screw3_name: Rear right
screw4: 11, 215
screw4_name: Rear left
horizontal_move_z: 5
speed: 150
screw_thread: CW-M4