import sys
sys.path.append('./src')
from cadmium import *
u = Box(62,62,100, center=True) + Sphere(19).translate(-31,-31,-31)```
when run with current HEAD, I get:
```Traceback (most recent call last):
File "examples/fail.py", line 5, in <module>
u = Box(62,62,100, center=True) + Sphere(19).translate(-31,-31,-31)
File "./src/cadmium/solid.py", line 50, in __add__
union = BRepAlgoAPI_Fuse(self.shape, other.shape).Shape()
File "/usr/lib/pymodules/python2.7/OCC/BRepAlgoAPI.py", line 222, in __init__
_BRepAlgoAPI.BRepAlgoAPI_Fuse_swiginit(self,_BRepAlgoAPI.new_BRepAlgoAPI_Fuse(*args))
RuntimeError: Standard_ConstructionError```
please look at this: