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The software is pretty easy to use. I used Tinkercad.com to design the nose cone. Tinkercad saves the instructions as an STL file. Then import the STL file into Cura (download and install for Windows) and save the instructions again as gcode. Cura conveniently defaults to saving the gcode onto the SD card you have inserted into your computer. My printer uses microSD, so I use a SD to microSD adapter in my computer. Then insert the microSD card into the printer and select the gcode file and away it goes.
There are countless ready made STL files available to download for free. I did see one for a radial engine, but I don't remember where (maybe yeggi.com).
There's a learning curve, but 3D printing is now pretty popular, so there's a lot available for free. Search for 3D printing on Youtube and you will find everything you want to know.
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