Cleaning up 3d scanned models I'm scanning real life compositions of my own (just books and things) using an app on my phone called 123D Catch.

Once scanned I have the option of downloading these files in .obj, .3dp and .stl formats. 

The files need a lot of cleaning up with a lot of background interference being included in the result and the odd hole needing to be filled in and a base to be put on the scan.

I'm completely new to this software and I'm wondering if there's an easy 'delete' tool where I can delete all the parts of the .stl file on the screen which have shown up around my scan? And also a tool or way of going about (in quite a rudamentary way is fine) filling in a couple of holes which have shown up on the walls of my scan where it hasn't captured completely and also of fitting a base to the model? It just needs to be fit to be sent to the printer and I don't think it is quite yet.

Thanks in advance!

Rob
In edit mode in the mesh menu, there is a mesh cleanup submenu. One of the options is fill holes.