I've been using 3D printed parts quite a bit lately. I cannot answer your second question but, I wanted to post 2 points about removing the parts:

1) I use Tamiya Sharp Pointed Side Cutter NO.123 (74123). They have a long, sharp point that really gets into the nooks and cuts the runners off effectively.

2) I have found that many times instead of cutting the part at the attachment point on the part, I cut the runner at the waver while guarding the part from flying away (tape would work if unsure of holding the part with your fingers). Then, I gently cut the runner away from the part. This ensures that I can see clearly where the attachment point is on the part itself.

Of course, practice helps and you will find your best method.

Hopefully this helps.