Ultrasonic cutting knife with cooling fan

A cheap 35W ultrasonic cutting mainboard and knife kit was available online. The seller provided the casing files, and although it's compact, it lacks active cooling, so I designed a casing with active cooling.

The original design aimed for a 20*20 turbine fan, but the airflow felt weak. Using a 20*20 small fan didn't seem much better. Ultimately, I decided to use a 25*25*10 Sunon fan. If placed inside the machine

the entire thing would become longer, and I didn't think the cooling would be very effective, so I just made it thicker and placed it on the side. It's a bit bulkier and uglier, but I believe the cooling will be much better. The fan's power is directly supplied from the mainboard's power port.

The board has soldering points, so the fan is powered directly when the mainboard is turned on and starts spinning. Considering using a power bank for power and saving energy, I designed a switch that powers it on when pressed and turns it off when pressed again.

The machine's switch comes with a rubber switch from the seller, so there's no need to print it. The switch in the print files is for the fan. It uses a single-button electronic switch, max 10W. For those wanting to save on costs, a mechanical switch can be used, or it can be left unswitched.

M2*6 and M2*9 screws are used. I didn't have suitable screws for the fan on hand, so I just secured it loosely; you can use appropriate screws to fix it yourself.

The overall design of the cutting knife is quite ordinary, and aesthetics weren't a major consideration. I feel that practicality is sufficient, and I hope some experts can improve upon it.

The seller of this cutting knife has bypassed the power negotiation, so it is directly powered. To increase power, you can supply it yourself or use a trigger module. I tested it with 9V power, and the cutting knife's power reached over 20W, not counting the fan. The fan doesn't need a buck converter, and starting at 9V isn't a big issue; the airflow is much greater. However, its lifespan likely won't be long. But ultrasonic cutting knives cannot operate for extended periods anyway.

The design is quite ordinary; if you mind, please don't criticize. Discussions are welcome.