Required Characters: Blaster, Imperial, Lando
Canister 1: Enter the second Docking Platform by heading up past the small platform. Technically you need a Blaster character to build a platform to reach it. But any Jedi can just Jump up to it.
Canister 2 (Blaster): Go to the Falcon's Docking Platform in the last stage. Build the Astromech Panel and use it to deactivate the Force Field. Build the platform in the middle to reach the Canister.
Canister 3: On the way down to the next area. You'll see a Canister in the air. Jump to it.
Canister 4 (Imperial): Head past the next area's entrance and build the Imperial Panel. Use it to deactivate the Force Field. The Canister sits behind it.
Canister 5: Head to where you could rebuild 3PO in the last level. It's sitting over the conveyer belt.
Canister 6: Sitting out in the open, on the small raised platform, after looping around the Force Field.
Canister 7 (Lando): At the split path, head right. Deactivate the Force Field with the bricks built into an Astromech Panel. Head to the end and build these bricks into a Bespin Panel. Use it to enter the Dining Room. It's sitting on the table.
Canister 8: You'll see it high above a grate on the top level. Jump to it.
Canister 9: There's another grate over from the last Canister, it's sitting above this one.
Canister 10: Sitting at the back corner, high in the air.
Unlocked Characters: Darth Vader (35,000)