Level 3 drawings unlock requirements: recycling 100 copies of scrap in the recycling station.
A way to steadily increase follower loadout levels. The recycled scraps are some green clothes, store junk materials, etc. Except for the follower's equipments, the recycled scraps are some green clothes, store junk materials, etc. Level 3 recycling station can open 665 clothes to bind the purple clothes.
The 100 pieces of scrap required to unlock the drawings can be accomplished cumulatively by setting up recycling stations with multiple numbers.