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I have printed the engine including the gearboxes, but at 130% scale using my 4 year old Ultimaker.
So I could use 4 mm silversteel for most axisses and 13 mm bearings.
Some of the larger parts I splitted into two parts using Netfabb basic and glued the parts together

Sofar I cannot find the exhaust piping as on your overview picture .

I will upload some pictures soon

Please provide me with the exhaust piping stl-files

Wim de Groot
The Netherlands