Quote Originally Posted by gmay3 View Post
If anyone has pictures, I'd love to see some printed objects side by side sliced with open source vs closed just to see the difference.
No comparison pictures, but I can offer this comparison -

Make:2015 Shoot Out negative space tolerance test:
Slic3r 1.1.7: Three of five pins removable
Repetier-Host v1.0.6/Cura Engine: Two of five pins removable
Simplify3D v2.2.0: Four of five pins removeable

MakerFaire print-in-place articulated robot 65% model:
Slic3r 1.1.7: All eleven joints operable, but some took some careful teasing to get them working
Repetier-Host v1.0.6/Cura Engine: Only six of the eleven joints were operable, even after teasing
Simplify3D: All eleven joints operable, with little or no teasing needed on the final print

DISCLAIMER: These results are not from a controlled comparison test - for example, different filament ended up being used for each