I probably already know the answer but here it goes. At D3 whats the lowest DEF you'll consider for a PF? There is a guy I like whom has everything I love except a 35 low in defense. I probably should not settle but looking for backup on that stance. Thanks for the insight guys

Depending on what the rest of your team looks like, and if the player is really that good at other things I would consider taking that player.  But I wouldn't take multiple players with bad defense like that.  But one you can probably hide in your lineup so that he won't be a liability.
And to answer your original question, I would never take any player with ath or def below 30.  Not saying 30 is good, but it's the bare minimum I'll consider. A player with high potential in the mid to high 20's I may take on rare occasion, but I wouldnt want to play them for a while.

You can't really make any determination without knowing a bunch of other factors - What defense do you play?  What are his other potentials?  Will he be an offensive star, or a rebounding beast?  Do you need a specialist in those areas?  

If he's got big Ath and Blk, he won't kill you on defense at D3.  As noted above, if he's a super rebounder and/or scorer or something it might not even matter if he's a liability on defense.

In a zone, you can hide a low DEF guy a lot easier. In man to man, the low DEF guy will kill you against a competent coach. With that being said, I have had some success with low DEF guys off the bench. I had an All American at Princeton who had like like a 60 DEF but came off the bench and scored ~20 ppg.

Back to your original question, I don't have a minimum DEF score for bench players. If I know the guy will never start, I'll recruit a super low defensive player if he will be a very efficient scorer.

If I think he'll eventually be a starter, I am hard pressed to go below 50 in MM or Press or 40 in zone. In MM and Press, it's easier to swallow if he can play the 1-3. Moving him around on the least likely scorer is helpful but takes away your ability to attack his best defender.

Hey flash, I looked at your St Olaf team. You really need to improve defensively if you want your Press to be effective. Only 1 of your returning 8 players is a decent defender ( Rollins 66). At D3 you need to recruit players who can end up above 50. Most of your guys are 30's & 20's. Your freshman center Hurley with the 1 speed and 35 D is going to hurt you in the press. I hope you find this info useful. GL!