don't suppose someone could point me in right direction?
I can point you in the direction I have previously used. As you have probably already found out, Aspire does not handle undercuts so when you attempt to import a 3d model like Einstein, you can't get the entire 3d model data.
My path to complete the head in the photos was described below. Please note, this process gives you slices that are just an outline of the slice, not any 3d data as Aspire does when you slice. I'm sure there are other ways to handle slicing a 3d model, this is just one.
1) downloaded free software for 3d printing called "slic3r"
2) imported the 3d model
3) rotated, resized, oriented to the size and oriectation I desired
4) save the new file with a new name.stl, this isn't a must, it's just a good idea in case something doesn't work down the line
5) set slic3r layerheight to the height (material thickness) you desire. Remember, this is 3d printing software so you're setting the printing thickness.
For this model I wanted 1/4" thick slices so my layer height was set to 6.35mm (1/4")
6) set nozzle diameter accordingly based upon your desired thicknesss. For my model I set nozzle diameter also to 6.35mm.
None of this is actually used, it is just to get the software to move forward in the process.
7) under File, select slice to SVG, give location and file name for output of the sliced data
open new file in Aspire and import the SVG file and there should be the number of layers you planned on with a slice on each layer
9) you can then increase or decrease the size of the "slices"
If you're interested, the model in the photos is alternating layers of acrylic and MDF. I machined all layers with a 1" hole as well as a couple of alignment holes. There will be an acrylic rod with LED's inside of it installed inside the head, it looks really cool with the light emitting on all those layers.