A medical device system may include a set of housing portions, which includes a first housing portion and a second housing portion, and a third housing portion configured to be selectively operatively engaged with and disengaged from each of the first housing portion and the second housing portion. Each of one or more fluid conduits may provide a fluid path between a user and one or more reservoirs, for containing fluidic media, supported by at least one of the third housing portion and a selected one of the first housing portion and the second housing portion. A drive device supported by the third housing portion may be configured to transfer fluidic media between one of the one or more reservoirs and the user via the fluid conduit in a case where the third housing portion is operatively engaged with one of the first housing portion and the second housing portion.
