  We present a model of a configurable underwater drone, whose parts are
optimised for 3D printing processes. We show how - through the use of printable
adapters - several thrusters and ballast configurations can be implemented,
allowing different maneuvering possibilities. After introducing the model and
illustrating a set of possible configurations, we present a functional
prototype based on open source hardware and software solutions. The prototype
has been successfully tested in several dives in rivers and lakes around
Berlin. The reliability of the printed models has been tested only in
relatively shallow waters. However, we strongly believe that their availability
as freely downloadable models will motivate the general public to build and to
test underwater drones, thus speeding up the development of innovative
solutions and applications. The models and their documentation will be
available for download at the following link:
https://adapt.informatik.hu-berlin.de/schillaci/underwater.html.
