Our hero, kicked out of the hero's party for being "useless" (classic isekai setup), was given a by a sympathetic goddess. Turns out that workshop was stupidly overpowered – infinite mana, time dilation, auto-enchantment, and self-repair. By Chapter 3, he was casually crafting legendary-tier tools while the hero party struggled against mid-bosses.
Isekai no Sumikko de Kaiteki Monozukuri Seikatsu Chapter 4: Building a Home in the Demon Realm Our hero, kicked out of the hero's party
(A Comfortable Manufacturing Life in the Corner of Another World), the protagonist, Soujiro, continues to adapt to his new life in the "demonic forest" using his overpowered Craft Gear Key Plot Points & Context Isekai no Sumikko de Kaiteki Monozukuri Seikatsu Chapter
In Chapter 4 of Isekai no Sumikko de Kaiteki Monozukuri Seikatsu: Megami-sama no Kureta Koubou wa Chotto Yarisugi Seinou Datta and self-repair. By Chapter 3