MadModder

Magnetic mounts are not a great idea , IMO. 

You might want to go to three point {kinetic) fixing , to give better repeatability. There are considerable forces on the print head at large accelerations , hence the positive locks used on prusa and snapmaker machines, thst might cause issues with a spring loaded catch.

Yeah I haven't got to the extruder mounting yet this idea was just for docking the head while not in use.
My main source of inspiration is this guy:

Got this:
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I have been thinking lately about making a tool changing 3d printer and searching for inspiration, I found some with many (as in loads) of magnets but I think I may have a solution which would require none and I thought I would float the idea.

first off the mounting hardware will be the type of screws used to mount hdd's in place but without the rubber bits, the tool head would be inserted into the dock and moved sideways. rather than just a flat surface for the underside on the screw to sit on there is a recess this with the aid of a spring loaded pad will lock the tool head in place, see cad pic below.

This would mean that unless there was pressure to move the tool head back a touch it would be locked in place. I have printed up a test piece and included a picture this will not do as it is because the slots are in the way of the cooler channel.

OKMO RETROL 1/4 Scale Lister D Engine with some Mods.
I'm so thoroughly enjoying the Lister D and doing some small mods to it.
It's such a reliable engine, this hobbed nonslip drive pulley is going to work out terrific for running accessories from it, which I'm really looking forward to.

Hi Folks,
I finish the drive at my Langtoft house, and then get blagged by an old mate to "look at" a Fender guitar amp! I have some experience with guitar amps, mainly humping the bloody things about when I was roady
for a few local bands, and being an electrical engineer, had to jump into the breech and fix them when they started playing up before or during a gigI However my forte is not electronics, and this one needs component level diagnostics, but thanks to some brilliant info on the net, circuit diagrams and signal paths, I got stuck in and faults appeared and will be dealt with! I am awaiting the three capacitors to be delivered, and when they arrive I will fit them, do another test, and see how much nearer to full sound we are. This amp appears to have been driven hard and put away wet!!

Phil, in the East Yorkshire monsoon!