Steam Toy Train

This is my next design for my nephew. It similar to my previous design https://www.thingiverse.com/thing:3338151
Print the roof for the locomotive and the person car with support on.

Assembly Instructions
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Connector
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I use a neodym magnet with diameter 10mm and height 3mm. The head is a 11mm decorative nail (Polsternagel) with the pin cut off. A 5mm long brass pin with diameter 2 mm helps to to glue it to the base.
Alternatively you can use 8mm magnets (BrioBumper_8mm.stl)

Wheels
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The wheels are made with brass tubes (diameter 2mm, wall thickness 0.3mm) of length 29 mm and 9 mm decorative nails (Polsternagel). I use some 2 component epoxy glue under the head of the nail and inside the tube. Make sure that the wheels have enough distance. The inner distance between the wheels should be about 22mm. I use two 1mm shims when I mount the wheels to the base.
Alternatively you can use the file wheel_plastic.stl and a 2mm diameter b