Its really neat that we can look at a problem, sit down, design a fix, print it in so little time. I have printed several things from here for my trailer. Command style hooks, a knife holder and the 7pin trailer cap, just to name a few.
I use tinkercad as well, it has some limits but i find it fits my needs. I keep forgetting to post more of my designs. Post up what you designed or had a chance to make and have fun.