need help to slice a model

[fred_dot_u]

I won't be slicing it for you, but I dumped the file into Meshmixer to discover that it's completely "inside-out" in that all the surfaces have reversed normals. Meshmixer fixed most of them, then I did an Edit, Create Solid which fixed almost all the rest of the problems, but a few remained. For grins and giggles, I dumped your file to Netfabb Online Repair service . The result is attached. Your slicer should now give you the desired model.