Scrap Mechanic 1.0 Crafting and Schematics

How do I unlock a locked recipe?

A locked recipe is not short an ingredient. The recipe record checks whether the schematic is unlocked, so the schematic is a prerequisite and never belongs in the material bill.

Two routes open it. The Schematicbot can unlock a random eligible entry from a schematic box, or unlock an eligible part you already own. Before spending progression time on either, check whether the same item has another method, such as a different station recipe or a Mining Hub trade, because those skip the gate completely.

• A schematic is a prerequisite, not an ingredient in the material total.
• A schematic box unlocks one random eligible entry.
• The owned-part route unlocks that exact eligible part.
• Compare an alternate crafting or trade route before committing to the unlock.

A recipe route is a method, not just an ingredient list

One current item may be produced at a Craftbot, processed by another timed station, traded at the Mining Hub, or made through a schematic-gated route. These are separate acquisition methods with different prerequisites. Merging their inputs creates a fictional recipe that no station accepts.

Start with the output you need and inspect every available method. Select the route that matches your unlocked stations, currencies, and current location. The cheapest material total is not automatically the fastest route when it requires an unavailable schematic or a long chain of intermediate production.

Why station identity changes the answer

Stations can have different slot counts, execution rules, and speed multipliers. The same nominal craft time can therefore produce a different real queue time depending on which crafter profile owns the recipe.

What a schematic requirement actually means

A schematic flag means the recipe record explicitly checks for an unlock. It is not an extra physical ingredient and should never be added to the material bill. The flag also does not imply that every schematic has the same route: the Schematicbot can unlock from a random box or from an eligible owned part, and block unlocks can propagate to linked Saw Table recipes.

Plan the build in two phases when the preferred route is locked. First calculate what the production chain would cost after unlocking it. Then compare the progression work with any available trade or alternate crafting route. This keeps the material decision separate from the unlock decision.

Batch rounding explains most apparent calculator differences

Production happens in whole recipe batches. For a target quantity, divide the required amount by the recipe output and round up. If a recipe outputs 10 units per batch and you need 21, the executable plan requires three batches and produces 30. The nine-unit remainder is surplus, not an arithmetic error.

A reliable multi-stage planner carries that surplus forward before expanding the next demand. It also subtracts owned inventory at the correct stage. Rounding every intermediate number independently or discarding surplus will overstate the final material requirement.

The minimum batch formula

Required batches = ceiling(required output ÷ output per batch). Total ingredients = required batches × ingredients per batch. Apply the same rule recursively only after existing surplus and owned inventory have been consumed.

Craft time needs both recipe data and crafter behavior

The accepted station data uses the batch-time rule ceiling(recipe craft time ÷ crafter speed) × 40 ticks. A higher speed reduces the timed portion, but queue behavior determines whether several jobs overlap. Craftbot and Sawtable profiles can progress work in parallel; other timed stations process only their first active slot.

Slots are capacity, not always throughput. More queued slots can reduce player attention without shortening the current batch. When comparing upgrades, separate three benefits: jobs you can queue, batches that can run simultaneously, and the speed applied to each batch.

A dependable planning workflow

Enter the exact build quantity, inspect the selected route for each output, and review every schematic or trade marker before gathering materials. Add what you already own only after confirming units. Then read the result in order: goals, station steps, intermediate outputs, surplus, and remaining base materials.

If a result differs from an older guide, compare recipe version, output-per-batch, route selection, and rounding before assuming either number is wrong. Those four checks explain most disagreements and produce a plan you can reproduce at the station.

• Keep ordinary crafting, trade, and schematic routes visibly separate.
• Use whole batches and retain surplus between dependent steps.
• Do not treat all queue slots as parallel production.
• Copy the final plan only after verifying automatic route choices.