Dyne's Treadwell

[kresty]

Of course, as I recall the neck STL was created in sketchup, which I've heard has issues when used for printable files.

I've had 0 trouble with scale from sketchup, it exports STLs in mm and that usually works fine.  I do tiny things so sometimes Simplify 3D asks me if it's too small, but otherwise...

My problem with sketchup has been having good solids without holes and other problems.  Lately I've been using Cleanup3 (Sketchup Extension) to fix models before exporting and Solid Inspector2 (another extension) to check them (though I discovered a false positive with it today).  

Another great tool for cleaning up bad STLs - like random Thingiverse ones or whatnot - is Microsoft's 3D Builder (disclosure: I work for Microsoft on Windows).  Their repair function used to be "okay", but often had problems.  They must of updated something in the last month or two though because lately it's been fixing bad models pretty much perfectly.  (Previously it'd end up with strange planes and missing bits).  You can then re-export them back to STL or other formats.