HMS 1A00-0100-0002-0024: The Rack Failed to Detach the Hotend From the Toolhead
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HMS 1A00-0100-0002-0024 means the rack tried to take the hotend off the toolhead and could not, and Bambu tells you exactly what to check: the locking lever must be in the released position. A lever that has not released, or cannot, is the whole fault in most cases.
This is a mechanical latch problem rather than a detection one, which makes it one of the more satisfying codes to clear.
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Look at the lever, with the power off
Find the locking lever on the toolhead and work out which position is released. Then look at where it actually is. A lever sitting between positions is the common finding, and it will neither hold the hotend properly nor let it go.
Why a lever stops moving
Filament residue and dust pack into the pivot over time, and a pivot that has gone stiff moves part way under spring force and stops. A drop of dry PTFE lubricant at the pivot restores the travel; wet oil attracts the dust straight back, which is why dry is the right choice here.
Clear the debris before lubricating
A pick or a plastic pry tool lifts packed material out of the pivot without gouging it. Lubricating over debris just makes a paste that sets harder than what you started with. Work the lever through its full travel a few times afterwards and confirm it snaps rather than creeps. Keeping the whole mechanism clean is covered in the Bambu Lab H2D review.
What HMS 1A00-0100-0002-0024 leads to if forced
Running the swap again with the lever still engaged puts the full force of the rack against a latched hotend. That is how mounts get bent, and a bent mount is a part order rather than a clean. The related drop fault, where the grip let go instead, is HMS 1A00-0100-0002-0025.
The opposite end of the same move
If the toolhead was empty when the nesting started you get HMS 1A00-0100-0002-0021 instead. Detach failures mean a tool is present and stuck; empty-toolhead means there was nothing to move. Hotend construction is covered in 3D printing hotends.
HMS 1A00-0100-0002-0024 FAQ
Can I release the lever by hand?
Yes, with the machine idle, and that is the quickest confirmation of the diagnosis.
Will any lubricant do?
Prefer a dry film. Wet oils collect filament dust in a printer and the pivot stiffens again within weeks.
Is the lever replaceable?
It is part of the toolhead assembly, so a damaged one means a toolhead part. Cleaning fixes nearly all of them.
Why does it only fail sometimes?
Because a stiff pivot is temperature and position dependent. Intermittent is the normal early symptom.
A fetch can be blocked at the carriage rather than the latch. HMS 1A00-0100-0002-0031 means a hotend is already mounted, and the machine will not stack a second one on it.
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