Customized version of https://www.thingiverse.com/thing:3446199

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=3446199

Although the 'A' engines are 13mm across, many rocket kits that use them have a screw-on retaining cap that is a little over 10mm across. This was made to display those rockets with the cap installed (but no engine)

Using the following options:

Step_Diameter = 120
Foot_Count = 3
Engine_Diameter = 9
Engine_Depth = 45