adding exact parameter to get_mass_properties check call. Thanks to

@JasperBoogers

stl/base.py

@@ -419,7 +419,7 @@ def get_mass_properties(self):
  Documentation can be found here:
  https://www.geometrictools.com/Documentation/PolyhedralMassProperties.pdf
  '''
- self.check()
+ self.check(True)
 
  def subexpression(x):
  w0, w1, w2 = x[:, 0], x[:, 1], x[:, 2]