I can confirm the MK8 version works perfectly, no need to find the correct lighter.
After some testing with PLA, I am very impressed by the performance.
This simplistic design is easy to print, build and without the need to source a lot or difficult parts.
The only thing to take note of, is the 200mm PTFE suggested in the description which is far from sufficient. I have used 300mm length, which I believe is the minimum length needed for a smooth loopback.
Check the photo's I included in the 'make' I posted.