I wanted to give my son a NYC subway train to use with his other wooden trains but I felt 30 dollars was too much.
So I designed my own version of an NYC train compatible with other wood and magnet trains.
Since the train uses a 5mm magnet ball as the connector it can connect to other trains in any orientation.
The subway car and bottom are separate so that anyone or myself in the future could design a new top.
The magnets aren't installed in the picture above since they haven't arrived, what I did do was use some 8mm x 1mm magnets I had and used those for now so that my son can use it with other trains. I will post an update picture when the magnets arrive.
The first train is an SLA print the rest are PLA.
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The only part that should need support is the bottom section since it has the magnet holder that sticks out.
The pins should be 100% infill, it will make them strong enough to not break with kids use. I also suggest a drop off CA glue between the pin and body.
The only thing I suggest after removing the supports is to make sure the area where the magnet goes is smooth so that the ball can move freely inside.
A small drop of CA glue between the magnet holder and the bottom is suggested to keep it together. Make sure the magnet does not get any glue as it is designed to be a loose fit inside and be able to rotate inside its holder to be able to connect to any train.
I started by grabbing one of my sons wooden trains and a pair of calipers and started modeling just the bottom section in fusion 360.
Once that was done I created the 2 pegs to attach the top and worked off of reference images of the NYC trains.