This is my new model rocket, a Honest John scaled 1:7.3
It fits a PML Phenolic 2.5"-tube (65 mm ID)

I printed all parts in ABS on my Ultimaker 2 Extended+
I used ma UM2 cas to close the thing up which prevents warping with ABS, I print with 250°C, 100°C heated bed and 50-60°C environmental temperature inside the printer housing.
The nose cones was printed with 0.8mm, the fins and spin rockets with 0.4mm

The Nose cone is in 2 parts which should fit snugly together, a 2.5" PMl Coupler fits into the base which allows it to connect to the airframe.
The fins have a cavity for a 1.5mm G10-Fin to add stablity.

In Total it is 100 cm long and should fly on something like a F40 or G64