<p>I'm using a Flashforge Pro and attempting to print a wheel about 6mm thick to serve as a platform.  In other words, the wheel doesn't have to be solid, but spokes won't do the job.  I've experimented with different temperatures, but, because of ABS' thermal expansion, I don't think that will solve the problem.  Also tried putting lots of 2mm holes in the wheel.  I've considered other designs for the interior, but doubt that would be a solution.  Has anyone tried using different print paths, i.e. actually altering the path that the slicer suggests?  (grasping at straws)
Thanks for your suggestions.</p>

If you can, set your slicer to do honeycomb fill.  Depending on the weight requirement choose maybe 10% - 20% fill.   That ought to do the trick.  It won't be solid, but it should be strong enough.
What are you going to put on the platform?