A DIY desk air cooler can be very simple: a USB fan, a frozen water pack or bottle, and a body that keeps the cold mass and airflow aligned. The goal is not to replace an air conditioner. The goal is a colder personal breeze near the desk.
The printed shell is useful because it turns loose parts into one object. It can hold the fan, keep the frozen pack in the right place and send the air in a more controlled direction than a bare fan sitting behind a bottle.
The frozen part is the fuel. Fill the pack or bottle with water, freeze it overnight and put it inside the cooler when you need it. The cooling effect lasts only while the ice stays cold, so this is best for focused periods rather than whole-day room cooling.
A USB fan keeps the setup low power and easy to place. It also makes the design more desk-friendly: laptop, power bank or USB adapter can run it without the noise and weight of a larger appliance.
Yuki Mini is the River reference for small spaces because it keeps the same frozen-pack idea in a compact format. It is the version to look at when the object needs to sit close to a laptop, shelf or bedside table.
The practical checklist is short: freeze the water, keep the airflow close, expect condensation, and use the cooler where a personal stream of colder air is enough.
Yuki Mini
A compact personal cooler for desks and small rooms: printed PLA parts, a quiet USB fan and a frozen water pack or bottle. It gives a close, steady stream of cooler, drier air without a compressor or refrigerant loop.
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