I designed a solder holder in Solidworks to make soldering easier. The holder as a base of 61 x 37 mm and is 43 mm tall without the wire roll. The roll I use has an outer diameter of 55 mm, 28 mm wide, and 19 mm diameter center.

Here is the link to the solder wire I use: https://www.amazon.com/MAIYUM-63-37-Solder-Electrical-Soldering/dp/B075WB98FJ/ref=sr_1_5?dchild=1&keywords=solder&qid=1593462856&sr=8-5

I have included the STL files as well as the Solidworks files

Enjoy!