[BUG] Core One L Z-travel limited to 21mm
There's a bug in the 6.5.2+12579 C1L firmware which occasionally results in the machine's entire Z-travel being limited to just 21 mm. I just powered-up my C1L this morning, with the bed at the lowest point in its travel. Unfortunately, the machine now recognizes that position as "+21 mm" on Z, so the bed can now only be raised 21 mm off the machine's floor, to a position that it recognizes as "0 mm" -- but which should actually be "+309 mm". This obviously renders the machine useless.
I ran the Z-calibration and Z-test routines yesterday, which might be related.
In the attached image, one can observe the bed's position, and that the machine believes that position to be "0 mm".
- Machine: Core One L
- Firmware Revision: 6.5.2+12579
- Modifications: none
RE: [BUG] Core One L Z-travel limited to 21mm
Rebooting the machine has no effect on the situation. Running the Z calibration routine does fix it, at least temporarily.
RE: [BUG] Core One L Z-travel limited to 21mm
Did you run an auto‑home after powering up the beast?
RE:
To elaborate on @kachidoki's post: "Z calibration" is a process you need to run rarely. It drives all Z motors down into the mechanical end stop. The goal is to make sure that the bed is leveled; but it does not define the Z position.
"Auto homing" (which includes homing in X, Y, Z) is a step you need to to every time after powering up the printer. It drives the axes into their "zero position" end stops, which for Z is all the way up where it touches the nozzle. This defines the XYZ positions, which the printer does not store when powered off.
Apologies in case this was all clear and the problem lies elsewhere.
RE: [BUG] Core One L Z-travel limited to 21mm
Thx Jürgen, that's exactly what I meant. 😅 Just a small addition: auto‑homing isn’t strictly mandatory. It is done automatically at the start of every print. You only need it when you want to manually move the axes.