HMS 0300-2600-0001-0007: Left Sensor Signal Frequency Is Too High
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HMS 0300-2600-0001-0007 means a high signal frequency was detected on the left extruder eddy current sensor, because it is installed too close to the target or because it is loose. Both causes are about position, and both can be checked with a measurement rather than an opinion.
A loose sensor is the more interesting cause here, because it drifts closer under vibration and then reports differently every run.
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Measure the standoff
A digital caliper across the mounting face tells you whether the sensor sits where the design puts it. Write the number down; if the fault returns you then have a before and after rather than a memory.
Shim rather than force
Where the clearance is genuinely short, a layer of polyimide tape on the mounting face is the clean way to add a few hundredths without machining anything. It also survives the temperatures around a hotend, which ordinary tape does not.
Secure the cable so it stops pulling
A sensor lead that tugs on every Y move will loosen a bracket over a few hundred hours. Heat shrink tubing over the strain point and a tidy route back to the loom removes the force that is causing the drift.
Then confirm with a calibration run
Once the position is right and the cable is no longer pulling, the calibration should settle to a repeatable number. If it still wanders, the mount is still moving. The routine is described in calibrating a 3D printer, and what a wrong offset does to the print is in Z offset and first layer squish.
How HMS 0300-2600-0001-0007 compares with the right side
The right-hand version is HMS 0300-2500-0001-0007, which blames the heat sink rather than the mounting. The left-hand message explicitly adds “loose”, which is the clue worth acting on.
And its opposite
Too weak a signal on the same sensor is HMS 0300-2600-0001-0002. Seeing both codes alternate is a strong sign the mount is moving rather than the sensor failing.
HMS 0300-2600-0001-0007 FAQ
How do I tell loose from too close?
Loose gives a different reading each run. Too close gives the same high reading every time.
Can I use ordinary tape to shim it?
No. It must survive hotend temperatures; polyimide does.
Does the code stop printing?
It blocks calibration, which eventually blocks reliable dual-material work.
Should I replace the sensor?
Not until the mounting is proven square, tight and correctly spaced.
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