3DPrinting
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The way I've embedded magnets in prints in the past was to:
Yes, I was a bit nervous about the magnet potentially jumping up and sticking to some ferromagnetic metal that's part of the print head, but that didn't happen in my case. YMMV, I guess.
I guess theoretically it could also be the case that the heat from printing could weaken the magnet, but again, that wasn't an issue in my case.
Just to elaborate on what my project was, I had a freely-spinning part that I wanted to be able to fix in place or unfix. I fashioned a "stop" that when engaged would fix the freely-spinning part in place. The way it works is that the stop can move freely up and down. Putting it in the "down" position fixes the freely-spinning part in place and gravity keeps it engaged. But to disengage it, you slide it straight up. At the top of the "track" in which it slides is where I put the magnet. I used the same technique as described above to embed a little stack of about four staples into the stop itself. So, by sliding the stop to the top of the track, the magnet attracts the staples, keeping the stop disengaged until you pull it back down again to where gravity will keep it engaged until you move it back up.
If you do this, make really good notes and markings on the polarity of your magnets.
The number of times I have tried this, to end up with two mating parts that repel each other.
Alternatively, just print recesses and glue them in afterwards.
I just stack the magnets first to get them all in the same polarity, and insert them, using the stack to push it into the hole, with a press fit they won't jump out
I've used a lot of 12x3mm and smaller magnets without them jumping up and attaching to the print head but I did have it happen with larger 40x10x3 rectangular magnets. It ruined the print and caused a huge clog, but I came up with another way to embed magnets because of it.
I designed a long 10x3 tunnel into the print, printed the object without pause, then slid the magnets into the tunnel. I printed a couple spacers to go between the magnets to place them how I wanted them and I printed a plug to glue into the opening of the tunnel. The plug was a second color so it stood out and made a little accent.
I haven't done it yet but I thought it would be cool to add a little decorative design to the original object to be printed in a second color and make the tunnel plug the same second color and hide it in the decorative design.
My magnets pull towards the printbed when i put them in.
But i also only cover them with a single .2 layer so they keep their strength.
Of course, if they're on the bottom of the print.