The true smallest possible STL file 84 bytes

@6d6178 @snail Challenge accepted. This attached STL contain all of the required 80 bytes STL file header and 4 bytes reserved for unsigned integer. This is CAN NOT be printed nor sliced, But can be examined to ensure it contains the proper header info. 

For a truly printable smallest STL file, please check out @6d6178 smallest printable file :

https://www.printables.com/model/810551-actual-worlds-smallest-stl-284-bytes-actual-fastes

Code in Python

header=bytes(80)  # 80 bytes of zeros
num_triangles=(0).to_bytes(4,byteorder='little')  # 0 triangles

with open('smallest_possible.stl','wb') as f:
   f.write(header + num_triangles)