My initial thought was that it was kapton tape to prevent heat transfer from nozzle to arm to magnet, causing it to overheat and lose magnetism.
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Its definitely not magnetic as previously suggestedā¦ Iām playing with mine (which fell off yesterday). It has a purely adhesive attachment. Its definitely a simple tinted transparent piece of plastic.
Iām not sure how they expected this to stay on for any significant amount of time. Seems as though it was bound to dislodge and fall off at some point. The adhesive wasnāt terribly good.
Personally, if they were worried about friction, if might have made more sense to increase the deepness of the hole by 0.25 - 0.50mm. However that small change would likely cost a lot, so this may be a late cycle band aid.
Iāll probably leave mine sitting in the accessory box and not worry about it.
I got the reply regarding putting it back (which adhesive) from Bambulab:
We do not recommend using any adhesive, as it may affect the magnetās ability to hold.
You can try gently placing the part back on. If it doesnāt hold, thatās okay.
Cover of the magnet, not magnetic cover
mine fell of tooā¦ i cant really imagine this thing will stay on longā¦ its not sticking goodā¦ pretty sure this thing will mess up a few ppls printā¦ i put it back on but if it falls of again i wont put it back onā¦
i only had one down thereā¦
Mine fell off today. Their response does leave you wondering if they used magic, or hopes and prayers to attach it originally.