I don't own any 3D domains, so I am no expert.
But, I have a habit of looking @ domains from the perspective of someone sitting down and opening Bing to get something accomplished.
I cannot imagine people searching for the phrases that constitute your domains.
They aren't generic keyword domains and they aren't brandable.
Your best bet is to sell them to a new domainer who thinks any domain with "3D" in it has value.
Take any amount you can get. $10 is better than zero.