Rocket is printed with PET-G, but PLA works also. With Petg is slightly tight fit, but it will loose after few clicks. Landing legs are connected with 4x M3 screws and nuts, secured with loctite adhesive to hold place. They can move in this way and can be stored “for flight” upwards.
Some parts might need brim in case of PET-G, PLA was ok without it on MK4.
The author marked this model as their own original creation.