There is a typo that causes the game to crash when exiting the lab with a blueprint in hand.

The mod The Blueprint Designer Lab (1.0.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event BlueprintLab_design::on_gui_click (ID 1)
LuaPlayer doesn't contain key clean_cursor.
stack traceback:
[C]: in function 'index'
__BlueprintLab_design/scripts/logic.lua:130: in function 'ReturnBlueprintImport'
BlueprintLab_design/scripts/logic.lua:93: in function 'ToTheWorld'
BlueprintLab_design/scripts/logic.lua:9: in function 'OnLabButton'
BlueprintLab_design/scripts/gui.lua:46: in function <BlueprintLab_design/scripts/gui.lua:44>

It shold be clear_cursor, not clean_cursor.

Anyone looking for a quick fix.

In the mod files, find logic.lua, open with notepad and at line 130

It reads
if not player.clean_cursor() then

Change and save to read
if not player.clear_cursor() then

Thank you 4M_Peri!
I really wanted to fix this, it is a great mod.

Can we get this fix into a release please?

As an interim measure, Ive put out a typo fix here: https://mods.factorio.com/mod/BlueprintLab_Blu3wolf

As a longterm solution, either daniel90c comes back to update the mod, or we move over to a new alternative, or someone picks this mod up to maintain long term.

Im not currently offering any maintenance of this mod, which is why Ive left my upload as MIT.

A new alternative was just posted here: https://mods.factorio.com/mod/blueprint-sandboxes

Ill probably try it out on my next save, for now Ill be using the typo fix - thanks again to 4M_Peri for that.

Edit: It seems using a new name for the mod upload is problematic, as it means GUI unifier no longer works with it.