Editing Openai/695aac28-9538-8011-823a-ed005c76baf2 (section)

==== Reassembly – step by step (important bit) ====

===== 1️⃣ Start with the bottom housing =====

Use the half that has the microswitch inside.

Lay it flat with:
* Microswitch at the top
* Filament path running front to back

===== 2️⃣ Fit the two black round rollers =====
* They sit in the circular recesses in the housing.
* Their split side faces up.
* They should rotate freely.

These form the filament guide and the moving contact.

===== 3️⃣ Install the spring =====
* The point of the V faces downwards into the housing.
* The two legs sit against the plastic posts near the filament path.
* This spring provides pressure against the rollers.

⚠️ This is the part that usually jumps out.

===== 4️⃣ Add the metal retaining clip =====
* This clips over the spring.
* The hole in the clip aligns with the small plastic post.
* Its job is to stop the spring popping out while still allowing movement.

If this isn’t seated properly, the sensor won’t work reliably.

===== 5️⃣ Check movement (before closing) =====

Use a bit of filament or a small screwdriver:
* Push through the filament path
* You should feel spring resistance
* You should hear/feel a tiny click from the microswitch

If it doesn’t click → something is misaligned.

===== 6️⃣ Close the housing =====
* Place the top plastic half on carefully.
* Make sure: - Spring hasn’t shifted - Rollers stay seated
* Screw together gently (don’t overtighten – plastic threads).