This is a vertical stand to hold your rocket for display. The top end inserts into where the engine would go and holds the rocket as if it is getting ready to launch. I made these out of PLA but other materials will work just as well. The stand has the letters STD so you know it is for models that use A, B, and C engines. There are other versions for mini engines as well as for the larger D and E rocket motors and the sizes were based on the dimensions for Estes motors. The design was done in FreeCad and to convert to 3MF and have a successful print you will need to merge and repair after you import. The 3MF version has been built as is on my H2D printer with no issues.

Please like and boost if you find these helpful.