Factorio Forums

In Factorio you can insert an item stack into a chest or into another player's inventory in multiplayer by CTRL+clicking the target entity. In the controls this is named "Inventory transfer" and "Fast entity transfer", both having the default keybinding set to CONTROL + Left mouse button.

This works with empty blueprints (with no "blueprint recipe" on them) but not with blueprints already containing such a recipe. They won't do anything when CTRL is pressed, not even allow you to build them. The only way to give a blueprint to another player is to use a temporary chest.
Furthermore, you can't open that chest while having a blueprint in hand. You need to open the chest manually, then select the blueprint and insert it into the chest.

While this might be more of a feature request than a bug report, I still consider this to be a bug, as
(1) it works with empty blueprints
(2) it works with the deconstruction planner
(3) the CTRL-key has no use (yet?) when putting down blueprints

Disclaimer: This bug report is probably superfluous, pending the implementation of the blueprint book in 0.13. Nonetheless, I would like to be able to transfer a blueprint into another player's inventory using the "Fast inventory transfer" method.

Well, it is not a bug indeed. The problem is, that the selected entity is not evaluated when the non empty blueprint is in hand, as it is just showing the collision boxes and showing selected entity on top of it would just make it messy.
The blueprint book will partially solve it.