I tried an experiment today, but it failed.

You could also get some canned air or freezing (for electronic testing) to spray into the hole to cool it. eg http://www.jaycar.com.au/productView.asp?ID=NA1000

Did you do any more testing on this? If so, what did you go for and how did it work out?

@nathan_burley
I ordered some of these High Temperature neodymium magnets which should be good to 150C without any loss of magnetic strength:
https://www.kjmagnetics.com/proddetail.asp?prod=D82SH

I’ll place a small pre-printed insulator pad on top, and run the bed temp a little lower.
I’ll report here when when I’ve tried it.

Hey Robert, wondered whether these high temp neods worked in the end? I’ve got some currently which I’m looking at using to hold 2-part prints together. I should know in the next few days once my parts arrive from shapeways, but I’m not using FDM parts with magnets printed into them, I’m using MJM parts in which I can slot the mags.

Still - would be good to know whether you were successful.