Some people recommend that, in order to embed one or more magnets in printed objects, pause the printing, insert the magnet(s) into the cavity(ies) that was formed for it (them) and then resume printing. The only warning I’ve seen about this procedure is to make sure no magnet protrude out of its cavity, potentially blocking the print head’s path.
But what about the case in which the nozzle or hot-end is ferromagnetic? Wouldn’t the embedded magnet (s) attract it as it moves nearby, possibly altering its path off course?
I don’t think that’s much of an issue, the magnets most likely aren’t strong enough. You can push against the toolhead while it’s moving and it will still just keep moving, and if you do manage to stop it you get an error message and it pauses the print.
You are correct that magnets can get picked up or flipped out of the hole, by the nozzle passing over. Typically, the magnet pockets are made snug enough that the magnet is held in well enough that the nozzle won’t pick it up. But if it’s not snug, use a small drop of CA glue to anchor them in.
Before you drop the magnet in, put a drop of super glue in the hole. Be fast because its gonna dry fast. If ypure worried about an impact. Like from the fan shifting the magnet or whatever
Thgis stupidest thing i did was try to pause a print to fill a hollow print with sand to weight it before the printer sealed the top. Of course, the part cooling fan blew it everywhere. I don;t know what i was even thinking (probably wasn’t thinking, I giess).
I would dab a bit of accelerant into the seam around the magnet in this case as CA glue won’t cure fast in some plastics. Use a fine tipped paint brush and the thin accelerant will seep in to the well due to capillary forces.
It sounds like you were printing a tape dispenser. you can do that, but you have to turn the fans off until a full layer has printed to seal the sand in. For some reason the models that mention sand as a ballast forget to mention the fan.