Der Big Red Max Nosecone (Estes or LOC 3")

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This is the nosecone for the Estes Der Big Red Max model rocket (Estes #9721). https://estesrockets.com/product/009721-der-big-red-max/  It can also be used as a nose cone for Great Goblin rocket.

I have not fully print tested this, the shoulder diameter for the Estes version and the sleds might need adjustments.  Please let me know if that is the case.

The Der Big Red Max kit uses a 3" diameter body tube (part number 031799) that is 15.5 inches long.  It is not always easy to get that body tube, so I included a version that will fit an LOC 3" tube which is easier to get.  There is a slight size difference between the two.

At this scale it is too tall to print on most printers, so I broke it up into 3 pieces that screw together. One piece is the shoulder and the other two are the nosecone. I also noticed there was enough room on the inside to fit an electronics bay so I set that up. The sled is a blank so you can drill holes for zip ties or put screws in it or remix it to suit you needs. There is enough clearance in the center for a 9v battery if you want.

The bay slides into the bottom section of the cone from below, and when the shoulder is screwed in it should hold it firmly in place. If you plan to use the bay, don’t glue the shoulder on. It is up to you if you want to glue the top nosecone section to the bottom section or not. If you do, apply the glue sparingly to the threads in the top section, so as it screws together the glue is squeezed up to the inside of the cone rather than down to the outside.

The threaded hole at the bottom will accept an M8 bolt. You can use that to add weight temporarily if you like. If the sled is in place, only 15mm of the bolt will fit inside.
 

Print Settings
I used a 0.4 nozzle, layer height of .12, and wall thickness to 0.36. 

Do not use supports with the two nosecone parts, they are not needed but if you have supports on it will mess up the threads. You might want to use a raft as they are prone to warping early on. The shoulder shouldn’t need a raft, but it will need support around the overhang for the shock cord mount.

Supports should be blocked around the threaded areas at the bottom and top of the shoulder.