This is an easy to build catapulter expansion set.
You can also use your imagination to build your remixed version.
The new pieces allows you to move the catapulter arm up and to stretch the elastic rubber and to shot thanks to the trigger.
One thing that I didn't made is to create the lifter box with some cartoons.
I think that is better if you create your catapulter box by you own, in this way you will have fun and you will increase your imagination.
Obviously you can also combine the prices in different way to create very interesting design, the only limit is only your imagination!

I want to apologize if same pieces which you see in the picture are not as the pieces .stl you can download because I have printed tham before realizing that the contest doesn't allows me to do so big pieces.
Anyway I have uploaded some pictures that show you how to obtain tham.
All pieces of my design can enter in an area of 10x10x12.5cm

PIECES THAT YOU NEED:

(downloadable from the sets of official thikfun )

5.5” Rod (3 piece)
7” Rods (3 pieces)
Extra Long Connector Plate (2 pieces)
spool (1 pieces)
Hub caps (26 pieces)
Hole Punch (1 pieces)

(pieces invented by me)

C (2 pieces)
D (gomma ruota v1) (4 pieces) or D (ruote v2) (4 pieces)
F (cerchione) (4 pieces)
T (manovella)(1 pieces)
Q(1 pieces)
P(1 pieces)
Catapulta(2 pieces)
Coso catapulta (1 pieces)
Elastic rubber(1 pieces)

I build my own printer, is similar to the prusa i3

Doesn't Matter

Doesn't Matter

0.26

60%

You have to use support only with " F cerchine"

You have to take the file.stl "F (cerchione)" and the file "D (gomma ruota v1)" and to assemble them as the picture shows

You have to take one nine hole piece "Large_Connector_ThinkFun_Maker_Studio" and to joint it with the "C" Piece as the picture shows . In this way you have assemble one part of catapult skeleton . (You have to do it again two times) (to attached it to the c piece use aslo four Hub Caps

Now you have to take the two pieces "P" And "Q" They will work as a trigger and thanks to an elastic rubber you will be able to shot.
Now you have to position them on the catapult skeleton paying attention to the fact that the trigger (the piece called"Q") Can stop the teeth of the gear ("P"), once you find the exact position you have to put the "spool" with two Hub caps and then you can attached them to the stick through others three Hub caps.
(The stick must can rotate into the catapult skeleton hole, so you have to put four stick just to keep them in place)

Now you have to take two pieces of "catapulta" And one "coso catapulta" . Now you have to attach the "coso catapulta" To the two pieces "catapulta" with two Hub caps to the stick and the stick must be attached to the two pieces with two others Hub caps (must not be free to rotate)

Now you have to position the pieces previously assembled to the skeleton (as the picture shows) with two Hub caps (they must not be free to rotate)

Now as last step you have to connect the spool to the "coso catapulta" with an elastic rubber and you have to take one "T (manovella)" and attached it to the stick where is place the spool with one Hub cap

You have to lift the trigger from the gear, than you turn the handle to set the rubber in tension, than you put down the trigger in order to don't allow to the gear to turn. Now you arm the catapult,the last thing you have to do is to lift the trigger and... Shot!!!