This tool can help you with soldering, personally I prefer to have this container so I can hold the soldering in one hand and the soldering iron in the other. This is designed for a tin size of less than 1mm.

Manual

Using this container is quite simple, you have to insert the tin into the hole at the bottom of the inside of the container then wrap it up. then the internal part must be inserted into the external case by passing the solder through the hole in the upper part and then screwing the two parts to close the container.

Printing

I recommend printing the internal part with a light filament and the external part with a dark one, to have more contrast and facilitate the control of the remaining tin