Pulse Jet Engine (Version 2)

This is a lighter version of a previous design meant to take up less filamment and last longer before fully melting. The original version can be found here:
Summary
This is a working scalable pulse jet. I got it to run for a bit under 20 seconds before parts began to melt and it ran very stable and clean without needing a spark plug. To get it to run, I simply used a bicycle pump, a lighter, and some isopropyl alcohol. I printed it using regular PLA and it worked great. Please LIKE and FOLLOW if you want more fun designs like this. It would also help a ton if you could support my website https://rcbasics.com/ or my YouTube channel https://www.youtube.com/@BalsawoodRCPlanes-zx1je where I have other model airplane files and information.
Steps to start the pulse jet:

1. Add a tbsp of isopropyl alcohol if printing to 100% size (scale accordingly).
2. shake and rotate at least 360 degrees to guarantee that the isopropyl alcohol has coated the walls of the combustion chamber.
3