I designed this mainly because I was fed up with soldering things to esp32 boards and getting things wrong.
This is a tiny, simple part, designed to fit over the pins on a PCB, with enough room for a solid core wire to wrap through it and make contact with the pin.
Have a look at the photos to see how I've used them.
They're quick to print even at tiny layer heights.

IMPORTANT NOTE
I can make NO GUARANTEES with regards to the safety of this design. I have no idea how much current this can take, so use at your own risk.
I'm using this for less than 100mA, which I'm comfortable with. For higher currents, you'll probably want to use a rated connector or solder.

ANOTHER IMPORTANT NOTE
PLEASE take care when pushing these onto pins! They're a tight fit and with enough force, you could end up pushing the pin into your thumb. I'd recommend squeezing it down gently with pliers.

Creality

Ender 3

Doesn't Matter

No

0.08mm

I print with a small layer height to ensure accuracy. I haven't tested, but I imagine larger layer heights may affect this negatively. At 4mm tall it shouldn't take very long to print them at your finest resolution. I printed 4 in ten minutes at slow speeds.

It's a good idea to push this onto a pin and remove again before fitting the wire, just to ensure no blockages. Sometimes horizontal expansion/elephants foot can make the hole on one end smaller. Pushing the pin through as a fit test will help widen the hole.