HMS 0500-0400-0001-0006: Failed to Resume the Previous Print
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HMS 0500-0400-0001-0006 means the printer failed to resume the previous print. A resume attempt implies something stopped the job in the first place, and on a machine in a workshop that is usually the mains supply rather than the firmware.
Once is bad luck. Twice in a week on the same circuit is a measurement waiting to be taken.
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Find out what the supply is actually doing
A plug-in power meter left on the circuit records the voltage it sees, and a reading that dips when the compressor or the kettle starts tells you the cause in a day. Guessing at mains quality is how people replace boards that were never faulty.
Steady a supply that sags
Where the voltage genuinely wanders, a rack-mount power conditioner holds the supply inside the window the printer expects and sequences it on cleanly after an outage. On a long rural feed or a garage on a shared circuit this is the part that ends the problem.
Log it so you can prove it
An energy-monitoring smart plug timestamps every interruption, which turns “it keeps stopping” into a list of times you can compare against the printer’s own log. That comparison is the whole diagnosis.
Then decide whether to resume at all
A resume that fails cleanly is better than one that succeeds badly. If the head moved while the power was off, the layers will not line up and restarting is the honest choice — see the Bambu Lab H2D for how the machine handles it.
How HMS 0500-0400-0001-0006 differs from a download failure
A job that never arrived is HMS 0500-0400-0001-0001. This code means the job was running, which makes the interruption the thing to investigate.
What a bad resume looks like in the part
Offset layers at the resume point are the tell — see layer shifting. Door and temperature interactions are covered in HMS 0500-0400-0003-0009.
HMS 0500-0400-0001-0006 FAQ
Why did the print stop?
Most often mains. Measure the circuit before replacing anything.
Is resuming ever reliable?
On a short interruption, yes. After a long one, restart.
Will a UPS help?
It rides through a dip, which is usually all that is needed.
Can I tell where it stopped?
Look for the layer line in the part. It is visible.
The machine also watches your mains before it starts. HMS 0300-9100-0001-000E means a supply voltage mismatch was detected and chamber heater 1 has been disabled, which is a refusal rather than a fault.
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