Bambu AMS Reinforced Lock Lever–Heat Insert M4 Fix

Due to the setup of my Eibos Tetras Series X, the original locking lever (the tab) of my AMS was constantly under tension.

This constant mechanical stress caused the lock to break after some time.

I then tried numerous replacement levers from the internet.
Experience: Most of them fit geometrically, but could not withstand any tension – as soon as tension was applied, they simply popped out again.

My first idea was a classic solution:
Drill through the hole, insert a nut from below, and work from above with a screw and a printed lever.

Assessment: Principally feasible, but cumbersome and not mechanically optimal.

Then it turned out that heat inserts can be easily melted directly into the AMS housing.

Fact: At 180 °C, there is no danger to the AMS material (tested).

I used:

• Heat insert: M4 × 4 × 6.3 mm https://amzn.eu/d/81ljE3U
• Screw: M4 (longer version) https://amzn.eu/d/a07SEX0
• Additionally: 2 washers

The insert was melted in, then the screw was guided through the nipple and two washers and screwed directly to the AMS.

Advantages of this solution:

• The threaded insert ensures a stable, durable connection
• The longer screw also acts as a lever
• The closure can be finely adjusted (loosen or tighten)
• This allows the AMS to be closed more securely and evenly than with the original part

Personal recommendation:
This solution is significantly more robust than all printed clip or plug-in variants and is particularly suitable when – as in my case – accessories put permanent tension on the AMS lock.

I printed in ASA because ASA is simply stronger and more stable.