We are glad to add Collada (.dae) to the list of export formats that we support on 3DTin.
Collada is becoming a standard format to exchange 3D modeling data between applications. With the collada export of 3DTin models, you can now import your 3DTin work in wider variety of 3D tools.
Moreover, unlike OBJ/STL, collada files let us add unit information for the model. At present, we export the models by mapping length of single cube to 1cm. In future we will add interface to customize this option too.
This new enhancement will let you import your 3DTin models to Google Earth or Second Life, where you can have more fun with them.
Let us know if you see any problems.