I took a small detour from Mendel reproduction to explore printing Moustaches (I am participating in Movember). I first made a design that works very well for a larger Moustache but started to behave strangely in RepSnapper as I scaled it down. The slices would start getting too small and the part would have huge steps.
So I tweaked my design and made a second version that worked a little better (more rounded points and slightly better geometry). RepSnapper still had problems with strange layers with this version.
I ultimately made a third version with simpler geometry. This version worked very well for small Mo's (2nd-3rd image below) but RepSnapper did something even stranger on the versions with holes for a necklace cord or key chain (top two).