[blackwood]

We are using a MakerBot Replicator 2, we were fortunate enough to get one from the promotion last November by MakerBot and DonorsChoose to get a 3D printer in their short lived "3D printer in every school" campaign.
The Replicator 2 can only do PLA. You need a heated plate to do ABS and the "2" model doesn't have one.

We did have to print one part that broke, fortunately it was on another motor assembly and was a small part. Except for the pawl that we have, the parts on the winch take at least 4 or 5 hours to print (the largest parts I believe took over 20 hours but those are not really high load bearing). So we would be in a world of hurt if we had to rely on that. We do have some spares, and will probably have a few more by the next regional.