HMS 1A00-1300-0002-0001: The Hotend Rack Is Fully Occupied
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HMS 1A00-1300-0002-0001 means every slot in the hotend rack holds something and the machine needs a free bay to continue. Bambu asks you to remove at least one hotend. Nothing is broken and nothing is misplaced; you have simply asked for more tools than the rack can hold at once.
It is worth recognising this one quickly, because it reads like a malfunction and is really a scheduling message.
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Why a full rack blocks the operation
Swapping a hotend means putting one down before picking another up. With no empty bay there is nowhere to put the current one, so the sequence cannot start. The machine stops at the planning stage rather than halfway through a move.
Decide which hotend to take out
Take out the one the current plate does not use. If you are not sure, the nozzle sizes in the sliced file tell you which tools the job actually calls for, and anything outside that list is a candidate. Store it somewhere it will not collect dust on the mounting surfaces, because dirty surfaces are what cause the drop and detection faults.
Plan plates around the rack, not against it
A plate that calls for more distinct nozzles than the rack holds will stop here every time, however you shuffle the hotends. Either reduce the tool count in the slicer or split the job. This is the same constraint that shapes multi-material work on other architectures, discussed in IDEX printers.
How HMS 1A00-1300-0002-0001 differs from an occupied slot
A full rack is a capacity statement about every bay. A single bay holding something unexpected is HMS 1A00-0100-0002-0004, which means the machine’s record and the rack disagree. One is arithmetic, the other is a mismatch.
Building a sensible set
Most people converge on a small spread of sizes rather than one of everything, because each extra tool costs a bay and a swap. What the sizes actually change is in 3D printing hotends, and the platform is covered in the Bambu Lab H2D.
HMS 1A00-1300-0002-0001 FAQ
Can I add capacity?
Not by software. The bay count is physical, so the answer is fewer tools per plate.
Does it lose my print?
No. It stops before starting, so removing a hotend and continuing costs you nothing.
Which hotend should I store?
Whichever the current job does not name. Check the sliced file rather than guessing.
Should I keep spares outside the rack?
Yes, and keep their mounting faces clean. Dirty faces cause the nesting faults in this group.
Before a rack can be full it has to be commissioned. HMS 1A00-1200-0002-0010 means setup has never been run, which is the code most often mistaken for a defect.
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