HMS 1A00-E000-0001-0006: Rack Homing Travel Too Long, Loose Timing Belt
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HMS 1A00-E000-0001-0006 means the rack travelled further during homing than it should have needed to, and Bambu names the likely cause: a loose timing belt. Inspect and tighten it. A slack belt lets the motor turn while the rack lags, so the move goes on past the point where arrival was expected.
Overtravel and undertravel are different faults. This one says too far, and too far almost always means slip.
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Why a slack belt produces overtravel
The machine counts motor steps and infers position. A belt with too little tension skips or stretches under load, so the counted distance exceeds the actual distance moved. The rack arrives late, or not at all, and the controller sees a journey that ran long.
Inspect before tightening
Look at the belt itself first. Rounded or missing teeth mean a belt that will slip again at any tension, and a frayed edge means it has been running misaligned. A belt in that condition is a cheap replacement, and replacing it is the honest fix rather than winding the tensioner up.
Tension by feel, then by result
Aim for a belt that is firm and sings rather than one that is tight: over-tensioning loads the bearings and the motor shaft, and trades one fault for quieter, slower damage. What correct feels like is set out in 3D printer belt tension, and the pulleys and idlers deserve a look at the same time, because a seized idler stretches a belt locally.
How HMS 1A00-E000-0001-0006 differs from a blocked homing
Blocked means the rack stopped short, and that reads as HMS 1A00-1100-0002-0002 with obstruction as the first suspect. This code is the opposite direction, which is why Bambu names the belt rather than foreign objects.
What else a slack belt explains
If the toolhead has also been missing its target positions, the same class of fault is behind HMS 1A00-0100-0002-0027. Fixing tension once often clears several codes, which is worth knowing before you troubleshoot them separately.
HMS 1A00-E000-0001-0006 FAQ
How tight is correct?
Firm with a clear note when plucked, not rigid. Over-tension is its own fault.
Should I replace or tighten?
Tighten if the teeth are sound. Replace if any are rounded or missing.
Will it damage anything if ignored?
A slipping belt wears its pulleys, so the cheap repair becomes a less cheap one.
Does temperature affect it?
Slightly. An enclosed machine running hot will show a marginal belt sooner than a cold one — the platform is in the Bambu Lab H2D.
Not every fault is mechanical. HMS 1A00-3000-0001-0041 reads the presence sensor as short-circuit, which points at pinched insulation rather than at a loose connector.
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