I made this small device to make it easier to replace the printer nozzles.

I used this hexagonal socket wrench, which only costs $3 on Amazon, to build it, but any standard 6-millimeter socket wrench would fit perfectly.
https://www.amazon.com/dp/B07QKGHV43?ref=ppx_yo2_dt_b_product_details&th=1

I used a soldering iron to heat it slightly and firmly fixed the sleeve in the print. To ensure that the sleeve is firmly in place in the slot and does not loosen, I deliberately set a tighter tolerance in the design.