Crafter

Crafters allow you to use purchased blueprints to make items. Generally, crafted items are worth more money than its constituent items.

To choose a blueprint for the crafter, tap the crafter, then tap the "None" on the right of the pop-up (after the arrow). After that, choose a blueprint.

Upgrades
A crafter will operate at a electricity cost of $5 per use and crafts an item from the blueprint selected every 3 seconds.

The electricity cost can be upgraded, reducing the cost to $1 per use, while the crafting time can be upgraded, reducing the time to 1 second per item.