HMS 0700-2000-0002-0018: Excessive Resistance in the Tube Near the AMS
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HMS 0700-2000-0002-0018 means the AMS A Slot 1 assist motor stalled because of excessive resistance in the tube near the AMS. That short section carries the fittings, so the cause is usually a joint rather than a length of tube.
Near the unit means within reach of the first couplers, and those are consumable parts.
Where to buy
Replace the fittings at the unit
PC4-M6 bulkhead couplers wear at the teeth and at the internal shoulder, and a worn shoulder lets the tube sit proud of where it should stop. A pack costs a few dollars and renews every joint on that side.
Get the old fitting out without damage
A small adjustable wrench on the bulkhead flats backs a fitting out cleanly, instead of you levering at it with a screwdriver and cracking the housing. On an AMS shell that crack is permanent and visible.
Clear the bore before you reassemble
Filament dust packs into the first centimetre of tube and into the fitting throat. An electric air duster clears it in seconds and, unlike a canned propellant, leaves no moisture behind.
Then check how far the tube goes in
Push the tube in until it stops, not until it feels tight. A tube sitting a millimetre short leaves a step the filament has to climb on every load.
How HMS 0700-2000-0002-0018 differs from the long run
The stretch from the unit to the printer is HMS 0700-2000-0002-0017. This code is the short section at the unit itself, which is a different set of parts.
When the tube inside has failed
A broken internal tube reports HMS 0700-2000-0002-0023 rather than a stall. The unit and its fittings are described in printers with an AMS and the AMS hub guide.
HMS 0700-2000-0002-0018 FAQ
How do I know a fitting is worn?
The tube pulls out with light effort, or will not stay seated.
Which thread do I need?
Check the boss on your unit. M6 and M10 are both common.
Can I reuse the old collet?
If the teeth still bite. They are cheap enough not to gamble.
Does dust really cause a stall?
Packed into a fitting throat, yes. Clear it first.
The board that drives the motion system has its own code. HMS 0500-0300-0001-000C means the MC motor controller module is malfunctioning, and it asks you to check the connection.
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