Solder frame

This an old type of solder practice.
In danish called a “hønsenet”.
String it up with single stranded copper wire, and solder all crosspoints.

The one we used when i was an apprentice for electronic engineering, was made of Wood.

String first the side marked D4, and then the sides marked D5.
It takes up to 1.0mm wire.
The one on the picture is mounted with 0.7mm wire.
The crosses near the frame must be soldered quickly, to prevent the PLA from melting.
That’s part of the lesson :-)