3d modeled files not slicing well

I made a few quick large files for a project, and they all have square/rectangular flat bottoms, but when they are sliced the slicers do not start with a solid flat bottom, but rather put big gaps leaving about 20% of 1 side empty in a weird triangle and river delta looking mess until 1-2mm up and then try and bridge gaps a wide as 7-9mm and THEN put down several full coverage layers.

Now it actually made the bridging (I mean wow) but it wasnt pretty to watch 3 inch wide gaps filled by loose strings...which were then crosshatched. So it worked but WTH? Ive made sure the bottom is 100% flat, repaired them in netfab and they look fine in the preview renders but all three default MC slicers seem to have some sick desire to prove how great they can bridge!

Is there a known issue or technique to make sure the bottom layer reads as a contiguous layer, cause it looked fine in Blender and netfab.

The file is huge (8mb) so maybe its a resolution thing confusing the slicers?

 

The only time I have experienced what you described, the bottom was not as flat as I thought. I don't know MC, but in Cura there is an option to slice the bottom off until you have a guaranteed flat initial surface. Also check your raft settings perhaps and, always, initial proximity to the bed. Good luck!

 

Well I can tell you the model was created poorly But it was created with 100% solid flat bottom. Im pretty sure the file size was the issue, but I'll have to reduce it to see. its just a really strange effect. The print was successful though the bottom is completed fracked.

http://www.combathanger.com/geekthinks/pics/stringy.jpg

(big picture so no imbed)