Printer-friendlier Fidget Rocket

A printer-friendlier remix of Eskimo_Pie's wonderful fidget rocket.

Technical Changes

• Made the ring connecting the outer engines taper off at the bottom, to only have one bridge thread on the lowest layer.

Design Changes

• Removed the pre-set NASA text, so now you can add whatever you like in the slicer.
• Removed the

Print settings

• Printer: BambuLab P1S
• Rafts: No
• Supports: No
• Resolution: 0.2mm and 0.4 mm work fine
• Infill: 10%
• Filament material: PLA, but should not matter too much