This is the base mount and Top to make yourself an Arduino based Echo Box, Distance Sensor.
The set slides on top of this thing http://www.thingiverse.com/thing:107982

The badBrick Echo Box is a complete kit. Fun for learning to program and play with an Arduino UNO R3. It comes fully assembled and works as a basic measurement tool. You can write a variety of sketches using the Ultrasonic sensor as well as program the LCD and all the buttons.
If you would like one, you can get the full Echo Box kit at http://www.badbrick.com/catalog

We also have all the other associated .stl files there. I didn't want to double post them all.

In MakerWare, I modify the "Medium" settings:
Quality: Layer Height = 0.2 and I increase the temp to 235C to let the larger prints fuse better.

All other defaults are the same.

** Note to Maker Ware users. I've downgraded our MW back to 2.1.x and the firmware back to 7.0.

For some reason our STLs were not printing correctly with the new 2.2 update. The slicer was printing partial faces that are not in the model.