This is my first upload so please excuse any mistakes.

I designed it with tinkercad for my old 12V electric pump.
I made two versions, one with higher walls, but the one with lower walls worked just fine for me.

its designed to adapt to these standard pump adapters with the pins.

I also printed these https://www.thingiverse.com/thing:4869919 to fit on the adapter.

I only used support unter the pinholders.

it should be about 4,5g filament

Creality

Ender-3 V3 KE

Yes

15%