With this bandsaw jig you can measure if the saw is parallel to the fence.
You need a 10x2mm magnet (2mm thickness), which is glued into the hole with super glue.
When mounted to the blade you can check whether the fence is parallel to the blade of the jigsaw and adjust either the table or the fence to make nice parallel cuts on the bandsaw.
I printed it with the back down (not the side with the hole for the magnet), so any bed level misconfiguration on the printer doesn't interfere with the measurement tool.
The author hasn't provided the model origin yet.