The rocket prints single wall vase mode. I am having success turning up the fan speed from 50% to 100% on the 4020 fan with the specific duct from Bondtech. I am now able to print the rocket perfectly in 1hr 57min start to finish. Flawless. And that is including time to warm the heaters. I am gonna print it faster and faster and see how quick I can make it. 0.8mm nozzle dia. 0.6mm layers. 600mm build height.
And I might have to make a pinball cabinet. Your build looks like a lot of fun.