this post was submitted on 29 Feb 2024
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It's held in with two fairly strong magnets, I don't think it falls off on its own. If a print falls over and catches on the extruder it could push the front off. I've had it happen for that reason.
Personally..... I'd just have left it off if I was them. I can't imagine a little plastic shield helps hot end temps
depending on the design, it might be to control air flow around the hot end's cooler block.
it's usually best to have some type of duct go from the fan and around the back of the block rather than just being open air- it keeps the air contained until it does it's job. But again, the only Bambu I saw was at microcenter and I was in a bit of a hurry so I didn't get a good look at it.