The concept is great, but the execution leaves a lot to be desired. The build was not difficult, but some advanced hints or clearer pictures would help. The thing that makes it not usable is the base. The base should have been a thicker piece of plastic not thinner. There is no way the current design can work with the much thinner and lighter bottom piece. It is too thin and too light. To use the base you have to attach it to something bigger and heavier, which will be a pain as one will need to cut and drill out space for access to the existing screws and holes. Frankly using a thinner plastic for it is ridiculous. If the thickness was at least as thick as the other pieces, the behavior would be much better. As is the weight of the top part is so much greater that the device flips around any time it moves quickly. Now I need to cut some wood or other material and connect it to the base so it can be used. Clearly one should not attach the supplied feet, as they will need to be removed when one makes a base piece with the mass required to stabilize the device.
Thanks for the feedback, Rich. This is exactly the type of thing we want to hear from you all, so please keep the feedback coming!
I’ll need to talk with Rich (the other Rich) about this, but maybe we can create a few different types of pan/tilt modules, as some work better than others for different applications. The one we shipped with tested will in the beta, so we stuck with that, but we’re always looking to improve!
Scott
So the thickness of the base doesn’t have much to do with it moving around. The base is mostly there to keep the unit from tipping over. Most people have found that securing the base somehow — take your pick-- tape, double-sided, etc or using a binder clip to secure it to the table is a good solution. Or even wedging the base between some magazines. Some kind of solution is necessary, but it’s simple. We should mention this in the docs. Thanks for writing. I don’t think it’s a fail however 
–rich
The base is fine - couldn’t make it too large without overwhelming the kit. Options to allow users to avoid kluges like double sided tape are to:
Make and post a second STL file with two pre-defined screw holes towards the rear of the base, to make it easy to mount on a piece of wood or a robot platform like the Geekbot base. Those can be drilled after the fact, yes, but why not hack the design?
And make an STL file for the upper acrylic piece that makes it possible to invert the pan servo. Many little robot bases come with ways to insert a servo motor, so with its motor pointed down the mechanism would easily mount directly without using the base.