3D Printing Crayon Rocket BT-80

[Jack Hydrazine]

This 3D modeling project will allow you to make and fly a Crayon Rocket. It was inspired by John Coker's webpage of his design, build, and flight of a box of crayon rockets.
http://www.jcrocket.com/crayons.shtml
You can see a flight video of them here.


These nose cones, tail ends, and fin cans are designed to fit Estes BT-80 airframe tubes.

https://www.thingiverse.com/thing:4974346

 

[John McClane]

Download link on thingiverse doesn't work. Any chance to add files for original bt 60 version?

 

[Jack Hydrazine]

Download link on thingiverse doesn't work. Any chance to add files for original bt 60 version?

I just tried downloading the files from Thingiverse and it seems to be working.

 

[John McClane]

Returning 404 error on my side. Same if I use vpn.

 

[OzHybrid]

Returning 404 error on my side. Same if I use vpn.

Make sure the website address matches. If https is default for your browser and you try to go to http site you can get this error. link is working for me. So it’s something at your end.

 

[OzHybrid]

If you install SCAD, you can import any stl file and use Scale on it to get it to the size you need for your tube. Pick your scale factor by the critical dimension. For a nose cone being printed this would be the diameter of the inside of your tube and the outside of the shoulder mating part of the nose cone you’re scaling. That way when you scale it will fit into your new tube.
in scad.
scale([1.5,1.5.1.5])import (“johnsNose.stl”);
would make johnsNose 1.5 times bigger ie 50% bigger. ANd scale([0.5,0.5,0.5])...... would make it half the size
But, you say, how do I know what size the shoulder is in the stl file. It doesn’t say. Cura is the answer. Drop any stl file into Cura and it will tell you the max dimension of an object on the table. Rotate the object and change z offset till the bit you want is above the bed and Cura will give you the size in LHS of window. or google bt60 bt80 tube sizes.

Have fun.

 

[John McClane]

Thanks fot the tips. Regarding download problem solved by downloading file by file. Actually I resize directly in cura and adjust for petg printing but shoulder is always issue, so thanks for the tip on rotating item. However that doesn't solve how to change shoulder size. Any tip for that part?