MadModder

As many of you know, I built a miniature replica  of the Monitors Steam Engine(s)  20 years ago.
Also many years of research went into that project as there were no detailed drawings until now of it's construction
The Mariners Museum in Newport News Virginia is the repository of the engine remains and are doing the recovery work
on it's conservation.  They are doing a video series (4) on the engine using my input and can be seen at
the link below. _ it is part one of the 4 parts and the other 3 will eventually be released

https://drive.google.com/file/d/1nnP5UBQRPnmVQW8_SHNqUIAWkp6mXNxY/view

I also did a Lecture  a few weeks ago at the Museum on how I did the 40 years of research in order to draw the engine and to build a miniature replica that you may find of interest.



Rich

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.