HMS 1A00-0100-0002-0025: Hotend Dropped While Nesting Into the Rack
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HMS 1A00-0100-0002-0025 means the hotend came loose while the machine was placing it into the rack, and Bambu tells you what to look for: excessive filament at the top of the hotend. Trim the residue, reinstall the hotend into the slot by hand, and continue.
This is unusually direct for a fault message. The instruction is the diagnosis, so do it literally before looking anywhere else.
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Why filament at the top is what drops it
The rack grips the hotend at defined surfaces. A collar of cooled filament around the top adds thickness where the mechanism expects none, so the hotend sits at a slight angle and the grip never fully engages. It holds for the first part of the move and lets go on the way in.
Trim it properly
Let the assembly cool, then cut the residue away with flush cutters rather than pulling at it: pulling takes thin layers off with it and leaves a rougher surface than you started with. The aim is a clean top face, not a tidy one. A brass brush finishes the surrounding metal without scratching it.
Then reinstall by hand
The message asks you to put the hotend back into the slot yourself before continuing, and that matters: the machine resumes from the assumption that the hotend is where it should be. Seat it flush, confirm it does not rock, and only then click through.
What HMS 1A00-0100-0002-0025 is not
A dropped hotend and a blocked mechanism are different faults with different fixes. If the rack could not move at all rather than losing its grip, the code is HMS 1A00-0100-0002-0026, which asks you to look for foreign objects instead.
Why residue builds up there at all
Oozing between swaps is normal and the material has to go somewhere. Machines that swap often accumulate it faster, which makes a quick look at the hotend top part of routine maintenance rather than a repair. The design context is in the Bambu Lab H2D review, and hotend construction is in 3D printing hotends.
HMS 1A00-0100-0002-0025 FAQ
Could the hotend be damaged?
Check the gripping surfaces before reinstalling. A dropped hotend has landed on something, and a burred edge will drop again.
Can I trim it hot?
No. Warm filament smears rather than cutting, and the surfaces you need clean are the ones you will coat.
How often should I check the top?
Whenever you change filament types, and any time a swap feels slower than usual.
Does it damage the rack?
A single drop rarely does. Repeated drops with the cause unfixed is a different matter — the machine family is covered in the H2D combo.
A grip that never released is a different fault from one that let go: HMS 1A00-0100-0002-0024, where Bambu names the locking lever and the position it has to be in.
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