Here are some simple and handy toolhead holders for those of us who swap out the toolhead to change exextruder diameters of our extruders.

There are two types:  One for toolhead #1 (leftmost) and another for the other three, #2-#4.  You can see both varieties together in the photo.

I printed them with PETG with a layer height of 0.24, but thicker layers will likely work as well.

Just drop the toolhead in, with extruder (there is clearance so that the nozzle tip remains surrounded by air