from stl import mesh
from mpl_toolkits import mplot3d
from matplotlib import pyplot
Create a new plot
figure = pyplot.figure()
axes = mplot3d.Axes3D(figure)
Load the STL files and add the vectors to the plot
your_mesh = mesh.Mesh.from_file('6.stl')#Здесь правим на свой файл
axes.add_collection3d(mplot3d.art3d.Poly3DCollection(your_mesh.vectors))
Auto scale to the mesh size
scale = your_mesh.points.flatten(-1)
axes.auto_scale_xyz(scale, scale, scale)
Show the plot to the screen
pyplot.show()