HMS 1A00-0100-0002-0030: No Hotend Found in That Slot While Fetching
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HMS 1A00-0100-0002-0030 means the machine went to collect a hotend from a specific slot and found that bay empty. Bambu asks you to install a hotend in the corresponding slot before continuing. Either it genuinely is empty, or the plate is asking for a tool you do not own.
This is the fetching half of the empty-slot problem, and the distinction matters: here the toolhead is empty and waiting.
Where to buy
Check what the plate actually asked for
Open the sliced file and look at which tools it assigns. A plate prepared for a different machine, or copied from a project with four nozzle sizes, will call for a slot you have never filled. That is not a fault; it is a file that does not match your hardware.
Then check the bay
If the plate is right, fit the hotend the message names and seat it flush. Look into the bay first: a fragment of purge under a hotend holds it proud enough to read as absent, and the fix is clearing the bay rather than pressing harder.
Keep the slot map stable
Decide which nozzle size lives in which bay and keep it that way. A rack whose contents move around produces this code and its mirror in rotation, and the time lost is all in working out which is which. Numbered labels solve it permanently.
What HMS 1A00-0100-0002-0030 is not
It is not the nesting version. An empty rack slot during nesting is a destination problem, reported as HMS 1A00-0100-0002-0003. Here the rack is the source, which is why the instruction is to install rather than to clear.
On a rack that has never been commissioned
If the machine behaves as though no slot has anything in it, check whether setup has been run at all — that is HMS 1A00-1200-0002-0010. Hotend options are covered in 3D printing hotends.
HMS 1A00-0100-0002-0030 FAQ
Can I reassign the slot in the slicer?
Yes, and for a plate that calls for a tool you lack that is the quickest fix.
Does the print resume?
It stops before the move, so fitting the hotend and continuing costs you nothing.
Why does it name slot 1?
Because that is the bay the current operation targeted. Another job may name another.
Could the detection be wrong?
It can, and a hotend you can see reported as missing points at the sensor — see HMS 1A00-3000-0001-0041.
One power-loss code reverses the instruction: HMS 1A00-2100-0002-0001 asks you to return the hotend to its rack station rather than to the toolhead, because it was mid-fetch.
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