A radial engine is an internal combustion engine configuration in which the cylinders radiate outward from a central housing like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a "star engine" in some other languages.
The radial configuration was commonly used for aircraft engines.

Unlike most radial configurations which work with a master-and-articulating-rod assembly, this design uses offset piston rods which all attach to the same crankshaft pin.


Printing and Assembly
The parts should be printed on a smooth build plate.
Avoid elephant foot and over-extrusion.

I printed the model on my Prusa MINI with PLA+ filament, layer height 0.2 mm.
Use glue where necessary.

For assembled and exploded views, have a look at the .stl files in the “VIEWS” map.
Printing and assembly in alphabetical order (A1 → E4).
In the “OPTIONAL” map you find five .stl-files for your own preference.
Printing tips are available for many parts.

Dimension: 199 x 141 x 110 mm.
Weight: 0.4 kg.


Post-processing
As always with mechanical models, be sure all moving parts run smoothly.
I use files, sandpaper and sharp hobby knifes. A few drops of motor oil may help too.
Pay special attention to seams on bearings and axles.
Maybe you need a 5 mm drill to widen the valve guides.


Metal parts
Six coil springs are needed for the valves, 10 mm width x 15 mm height. Wire thickness 0.6 or 0.7 mm (AliExpress).
Two short 4 mm scews or bolts are used to connect the model to the stand.


“ To educate and entertain”