XL Linear Actuator 18 studs stroke v1.1

movement range of 18 studs. internal planetary gearbox with 4 to 1 reduction. Please note that there is many Dust in the printed objects and they need much cleaning. In special the pipe with the tread inside contains a lot of dust . There are two sets which doing the same like this full set, but with the advantage that the outside parts can be ordered in black without doing this with the inside parts too. The second advantage is that the combination of these sets is some bucks cheaper in addition than the full set.
https://www.shapeways.com/model/2733821/
https://www.shapeways.com/model/2733817/