HMS 1A00-0100-0002-0035: Rack Movement Blocked While Fetching the Hotend
LayerWalker is a participant in the Amazon Services LLC Associates Program. We may earn a commission when you buy through links on our site, at no extra cost to you.
HMS 1A00-0100-0002-0035 means the rack met resistance while collecting a hotend and stopped rather than pushing through it. Bambu asks you to look for foreign objects, remove them and continue. Take that at face value: purge debris in the travel path accounts for nearly all of these.
A tool changer that stops when blocked is protecting itself. The same event without the stop would bend something.
Where to buy
Look along the whole path
With the power off, follow the full range of rack movement rather than inspecting the bay alone. Look underneath as well as on top, and use a light at a low angle: clear filament on a light surface is almost invisible viewed straight on.
Lift debris out rather than sweeping it
Tweezers or a grabber take fragments out cleanly. Sweeping pushes them further into the mechanism where you cannot see them and where they jam the lock rod instead. A short blast of air finishes the job once the solid pieces are gone.
Do not help it along by hand
Pushing the rack past a blockage while it is energised costs you the belt or the mount, not the obstruction. Clear first, then let the machine move itself.
How HMS 1A00-0100-0002-0035 differs from the nesting block
The nesting version is HMS 1A00-0100-0002-0026. The difference is only which half of the swap was running, and the fix is the same, which is worth knowing because the two get reported interchangeably by people describing the fault.
If the path is clear and it still stalls
Then the fault has moved from debris to mechanics, and the first thing to check is whether homing completes at all — that is HMS 1A00-1000-0002-0001. Belt condition comes next, and the machine layout is in the H2D combo.
HMS 1A00-0100-0002-0035 FAQ
Can I resume the print?
Usually, once the path is clear. The swap restarts rather than continuing from where it stalled.
What if I cannot see anything?
Look again with a raking light, then suspect tension rather than debris.
Is occasional blocking acceptable?
No. It means debris is accumulating faster than you clear it.
Where does the debris come from?
Purging between swaps, mostly, and from failed plates — see HMS 1A00-0100-0002-0034.
A move can also simply never arrive. HMS 1A00-1200-0002-0007 is a timeout rather than a block, which means drag belongs on the suspect list alongside debris.
LayerWalker
Print defect diagnosis, calibration procedures and parts that actually fit. Corrections welcome through the contact page.
