When not destroying laser cutters, I like to do a bit of 3D printing.
I have an ender 5 that I bought 2 years ago to which I’ve fitted a number of standard modifications (BTT SKR mini E3, direct dirve extruder, Meanwell power supply etc.)
The E3 controller made things a lot quieter with the TMC2209 drivers which left the main source of noise as the fans.
As finding quiet, 24V fans is near impossible, I’m doing the modification as covered by Teaching Tech Buck converters: Quieten your 3D printer with a Noctua fan & directly power your Pi - YouTube. To make things a little tidier, I’ve designed a PCB to hold the DC-DC buck converter and some JST connectors. I’ve also added a second DC-DC converter to run the Raspberry Pi (Octoprint). After a few iterations (it’s been many years since I designed a PCB), finally sent the files off to have them made.
I’ll know in a few weeks if I got it right. (Total cost for 5 boards with shipping was $A16)