Hey, there.
I rounded up a batch for you here by checking tests 7-18 and 29-38.
I used a loose definition of 3D, just so you'd have more to practice.
Some of them give you a cast of characters and a secondary characteristic that's currently undetermined ... some give you a cast of characters with the secondary characteristic already determined ... and some of them are just spatial diagrams that involve more than one row.
Test 7 - game 2 and 4
Test 10 - game 4
Test 14 - game 2 and 4
Test 16 - game 2
Test 18 - game 2
Test 29 - game 4
Test 30 - game 1 and 3
Test 31 - game 1
Test 32 - game 1
Test 35 - game 1 and 3
Test 36 - game 2 and 4
Test 38 - game 4
And here are some 3D games from the Manhattan LSAT Logic Games Challenge
http://www.manhattanlsat.com/logic-games-practice.cfmTheater festival
A fishy game
The reindeer game
Groomer's challenge
Rock & ball
Composite boards
The basket game
Jambalaya
Enjoy!