My first thingy! Want to fly a rocket? Need one that looks cool? Well here is a 3D rocket that actually flies (motor not included).
Update (2015_5_6): rsilvers has made an improved nose cone
Update: added a new payload ("payload2"). It has the built in rail guid and parachute mount near the bottom. You will have to tie on the parachute then screw on the payload. Hopefully it doesn't block to charge that blows the parachute.
This is a 3D printable rocket that takes a Estes B motor (18x70mm). I recommend about a 4 to 6 second delay on this. Previous tests were done with a 0 second delay motor and (needless to say) deployed the chute too early.
When printing, be mindful of the height of the models. I found out after 3 failed prints that I needed 124mm of height to complete these so I needed to reburn my Prusa firmware. With a 1 or 2mm brim the motor holder printed very nicely.
I made my chute out of a Kroger bag, some string, and hotglue. A rubber band glued into a paper fold is used in the payload section to keep the nosecone and chute connected. I posted a picture of it. The rubberband absorbs the shock of the chute deployment.
Glue a straw to the side so that it acts as a guide rail.
To launch, just buy the motors on the internet or at a local hobby shop (look up Estes B motors). Use a stiff wire as a guide rail and slide rocket on. Wire up the ignition plugs that come with the motors using aligator clips. To fire, simply tough the end leads to a 9V batter. Had 3 good launchs with the prototype!
Have fun and be safe!!!