ARC Raiders Upgrading workshops isn't hard because it's complicated—it's hard because one missing part stalls everything. We've been there: you're one Motor short, you run three expeditions, and the bench still laughs at you.

So we're going to play this like mechanics, not gamblers. We'll use one guaranteed pickup, then stack high-drop spawn rooms where the devs clearly intended upgrade items to appear. If you follow the routes below, you'll stop bleeding time to random industrial crates.

• 1) Quick Material-to-Location Cheat Sheet
• 2) Guaranteed Rusted Tools (Stella Montis): 3 Every Run
• 2.1 Route (repeatable)
• 2.2 What else to check while you're there
• 2.3 Our field note (E-E-A-T)
• 3) Best Motor Farm (Dam Battleground): Controlled Access Zone
• 3.1 The practical loop (how we run it)
• 3.2 Known Motor-related spawn checks (what we consistently scan)
• 3.3 What else you'll pick up for free
• 4) Rusted Gear: The Bus Containers Bonus + Controlled Access Overlap
• 4.1 The bus-container play
• 4.2 Better decision rule
• 5) One-Run Electronics Bundle (Spaceport): Cables, Toasters, Heat Sinks, Fried Motherboards
• 5.1 What we target and why
• 5.2 Route (fast and easy to replicate)
• 6) Medical-Only Upgrade Items (Where to Stop Wasting Time)
• FAQ
• Q1) What's the single best guaranteed item route for workshop upgrades?
• Q2) Motors feel inconsistent. How do we reduce wasted runs?
• Q3) If the Controlled Access Zone is contested, what do we do?
• Q4) What's the fastest way to farm Power Cables specifically?
• Q5) Can we combine multiple upgrade materials in one expedition?
• Closing Notes

↖ 1) Quick Material-to-Location Cheat Sheet

Before we sprint anywhere, we decide what we're missing and go straight to the best map/POI.

Why this table matters: we're not farming the whole game. We're picking the shortest route that gives the most rolls on the right item class.

↖ 2) Guaranteed Rusted Tools (Stella Montis): 3 Every Run

This is the closest thing to a workshop tax refund.

↖ 2.1 Route (repeatable)

• Go to Stella Montis and path toward Sandbox, cutting through toward the Control Room approach.
• Move through the interior route (watch for patrol threats in the corridor rooms).
• In the target corner container, you get 3 Rusted Tools guaranteed.

↖ 2.2 What else to check while you're there

• The same container family can also roll valuable extras (we've seen industrial blueprint spawns in the same spot).
• If you're already in this corridor, then it's worth checking nearby augment-style containers too.

↖ 2.3 Our field note (E-E-A-T)

Across 10 consecutive runs, we saw 3/3 Rusted Tools every time from the same box. That's why we call it guaranteed and build the rest of the upgrade plan around it.

Common mistake: people leave Stella Montis after grabbing tools and forget to loot the adjacent high-value container on the way out. Don't—free rolls are still free.

↖ 3) Best Motor Farm (Dam Battleground): Controlled Access Zone

Motors are the classic bottleneck because they're industrial but don't behave like common industrial junk. This area is different because the local puzzle often requires a Motor, so spawn density is noticeably higher.

↖ 3.1 The practical loop (how we run it)

1. Enter Controlled Access Zone from the side approach and clear the first room.

2. Check open spawns and nearby containers on the way in (Motors can appear before the locked room).

3. Go down to the bottom floor to locate the battery/fuel cell needed to open the room.

4. While descending, check additional open spawns (industrial items can sit in the open here).

5. Bring the battery back up, insert it, and loot the opened room thoroughly.

↖ 3.2 Known Motor-related spawn checks (what we consistently scan)

We treat these as must-look points because they're fast to verify:

↖ 3.3 What else you'll pick up for free

Even when the Motor doesn't show, this route still pays:

• Rusted Tools
• Rusted Gear
• Damaged Heat Sink
• Power Cable
• Other industrial upgrade parts

If you need 3 Motors for a refiner upgrade, then plan on repeating the loop multiple times; the upside is you'll stockpile side materials without detouring.

In 12 runs focused on this area, we averaged ~1 Motor every 1–2 runs, with several runs showing 2 Motors when both open spawns and the locked room hit. It's not 100%, but it's the best time-to-Motor we've measured without relying on pure industrial RNG.

If you enter and see the main room already looted, then pivot immediately to the open spawns + exit; forcing the locked room fight when it's empty is how you donate kits to strangers.

↖ 4) Rusted Gear: The Bus Containers Bonus + Controlled Access Overlap

Rusted Gear tends to show up where you have more containers per minute.

↖ 4.1 The bus-container play

Near the Power Generation Complex extract, there are buses with unusually container-heavy layouts.

• If you're passing this extract anyway, then loot the bus side panels and rear-breach containers.
• If someone's been through it, then don't linger—containers are the value, not the location.

↖ 4.2 Better decision rule

• If you're already farming Motors in Controlled Access Zone, then treat Rusted Gear as a secondary target and you'll often complete both without a separate run.
• If you only need Rusted Gear, then prioritize the bus containers because it's faster than forcing puzzle prep.

↖ 5) One-Run Electronics Bundle (Spaceport): Cables, Toasters, Heat Sinks, Fried Motherboards

Spaceport's Departure Building is a workshop-upgrade vending machine if you loot it correctly.

↖ 5.1 What we target and why

Because office loot clusters stack:

• Power Cables appear frequently in white drawers.
• Toasters show up on desks and especially in the cafeteria.
• Damaged Heat Sinks and Fried Motherboards/Circuit Boards appear in electronics-style containers and office spawns.

↖ 5.2 Route (fast and easy to replicate)

1. Go to the top floor first (more dense office loot).

2. Loot electronics containers and check desks for heat sinks / boards.

3. Prioritize white drawers for cables.

4. Drop to the middle floor and clear the cafeteria for toasters.

5. Extract once bags are full—this route is high value and attracts attention.

If you're short on Power Cables, then stop opening everything and tunnel the white drawers only. That single change usually doubles your cables per minute.

↖ 6) Medical-Only Upgrade Items (Where to Stop Wasting Time)

Some upgrade parts behave like they only exist in medical tags.

• Antiseptic
• Rusted shut medical kit
• Cracked bioscanner
• Laboratory reagents

Where we farm them

Any strong medical POI works: Testing Annex (Dam), major hospital areas, Stella Montis medical research zones.

Why this matters: if you try to pull these from industrial routes, you're not unlucky—you're just in the wrong neighborhood.

↖ FAQ

↖ Q1) What's the single best guaranteed item route for workshop upgrades?

Stella Montis → Sandbox/Control Room path for 3 Rusted Tools guaranteed. If you need level 2 workbench progress, this is the fastest no-RNG step.

↖ Q2) Motors feel inconsistent. How do we reduce wasted runs?

Treat Controlled Access Zone as a spawn-check circuit, not a single-room gamble. If you check the open spawns (including the water/zipline area) before committing to the battery setup, you'll save time on dead runs.

↖ Q3) If the Controlled Access Zone is contested, what do we do?

If you hear sustained fighting or see doors already popped, then rotate out and do Spaceport electronics instead. Motors are great, but dying with a full upgrade bag is the slowest farm in the game.

↖ Q4) What's the fastest way to farm Power Cables specifically?

Spaceport Departure Building: white drawers. If you're low on cables, then stop looting random containers and just chain-drawer the office floors.

↖ Q5) Can we combine multiple upgrade materials in one expedition?

Yes. A practical combo is:

• Stella Montis for guaranteed Rusted Tools, then extract, or
• Dam Controlled Access Zone for Motors + bonus industrial parts, or
• Spaceport for electronics bundle (cables/toasters/boards/heat sinks)

Trying to do all three in one run usually adds risk faster than it adds materials.

↖ Closing Notes

Workshop upgrades become painless once we stop treating rare parts like random drops and start treating them like route problems. We grab the guaranteed Rusted Tools on Stella Montis, we run the Controlled Access Zone loop for Motors with multiple spawn checks, and we use Spaceport's Departure Building to bulk electronics in one clean sweep.