Nozzle Tool Holder

There are 3 holes 5,2x5,2x2,2mm for 3 magnets 5x5x2mm https://www.aliexpress.com/item/1000007848044.html?spm=a2g0o.productlist.0.0.2a5f429fomuDPT&algo_pvid=0c0d0e47-2f5e-4918-9bbb-b0dd8f0ec0fa&algo_expid=0c0d0e47-2f5e-4918-9bbb-b0dd8f0ec0fa-0&btsid=0ab6d67915821834542522674e455b&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

look on the slicer's layer view to define when you must pause printing to add magnets. Layer number depends on resolution you will print.

A little tip:
It helps to add some cyanoacrylate glue in the holes, to prevent magnets to stick to steel extruder fan housing when resume printing

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