Lego Portal Turret




Introduction: Lego Portal Turret

These are the instructions for my popular design of a laser turret from Portal. It's all Lego; you won't need any other materials to make this nice display piece.

Step 1: Parts Needed

Here are the parts you'll need. You may have some, most, or all of these in your own collection; if not, you can get them from (or Lego's Pick-A-Brick , but they tend to be much more expensive, if somewhat easier). Part names may be different between Bricklink and Pick-A-Brick.

No. Color             LDraw no.     BL no.          Part name
4    Black              48729.dat       48729b        Bar 1.5L with Clip
2    Dark-Gray      44728.dat       44728          Bracket 1 x 2 - 2 x 2
2    Dark-Gray      4733.dat         4733             Brick 1 x 1 with Studs on Four Sides (color doesn't matter)
2    White              4733.dat         4733             Brick 1 x 1 with Studs on Four Sides
2    Black              47905.dat       47905           Brick 1 x 1 with Studs on Two Opposite Sides (can be Dark-Gray)
2    Black              4593.dat         4593              Hinge Control Stick
3    Black              3820.dat         983                Minifig Hand
1    Black              4497.dat         4497              Minifig Spear
2    Dark-Gray      30162.dat      30162            Minifig Tool Binoculars Town
2    Black              4006.dat         4006              Minifig Tool Spanner/Screwdriver
2    White              3024.dat         3024              Plate 1 x 1
8    Dark-Gray      4073.dat         4073              Plate 1 x 1 Round (color doesn't matter)
1    Trans-Red     4073.dat         4073              Plate 1 x 1 Round
2    Black               4085c.dat      4085               Plate 1 x 1 with Clip Vertical Type 3
2    Dark-Gray       4085c.dat      4085              Plate 1 x 1 with Clip Vertical Type 3 (type 4 is even better)
2    White               3023.dat        3023              Plate 1 x 2
2    Black               3794.dat        3794              Plate 1 x 2 with 1 Stud
4    White               3710.dat        3710              Plate 1 x 4
4    White               3460.dat        3460              Plate 1 x 8
2    White               3021.dat        3021              Plate 2 x 3
4    White               50746.dat      54200           Slope Brick 31 1 x 1 x 2/3
2    White               3048.dat        3048              Slope Brick 45 1 x 2 Triple
22  White               50950.dat      50950           Slope Brick Curved 3 x 1
5    White               61678.dat      61678           Slope Brick Curved 4 x 1
4    Black               4599.dat         4599              Tap 1 x 1
2    Black               41677.dat      41677            Technic Beam 2 x 0.5 Liftarm
2    White               6541.dat        6541               Technic Brick 1 x 1 with Hole
2    Light-Gray       4274.dat        4274               Technic Pin 1/2
1    Black               6558.dat         6558               Technic Pin Long with Friction and Slot
1    Light-Gray      4697b.dat       4696               Technic Pneumatic T Piece - Type II
4    White              3069b.dat       3069               Tile 1 x 2 with Groove

An Excel sheet of the parts with links and more information is attached.

Step 2: Step 1

Onto the build! I'll add hints down here for the Lego-illiterate. ;)

Step 3: Step 2

Yes, the tiles are supposed to swing back and forth loosely here. They will be secured later.

Step 4: Step 3

Unlike the previous step's bricks, these have studs (the knobby things) on all four vertical sides -- they are often called "travis bricks". This step ties the whole assembly thus far into one piece.

Step 5: Step 4

Step 6: Step 5

Step 7: Step 6

None of the non-white pieces' colors here matter much; they won't be very visible.

Step 8: Step 7

Notice that you do the same thing on the other side.

Step 9: Step 8

Step 10: Step 9

Step 11: Step 10

Step 12: Step 11

This connection may be a little loose; using newer clips or gently squeezing the clips before attaching the brackets can help.

Step 13: Step 12

The 1x1 slopes are called "cheese slopes", one of my favorite parts.

Step 14: Step 13

Step 15: Step 14

This one can be a bit tricky; the bases of the sticks, when put in together, should stick tight in the red plate.

Step 16: Step 15

Fit the previous assembly in the 1/2-plate gap that goes around the body. Try to fit the balls of the lever handles in the gap in the middle; this may take several tries. Once they're in, gently squeeze the body to slightly shrink the gap, to hold the eye in place.

Step 17: Step 16

Did you get the eye in? Great!

Step 18: Step 17

Step 19: Step 18

The tap's top can move around a bit within the slope, making for some nice angles.

Step 20: Step 19

Depending on the parts you have, you may have to pull the hands out of your minifigs' arms. It's okay, they won't mind.

Step 21: Step 20

Step 22: You're Done!

Once you've adjusted the legs to your liking, congratulations! You now have your very own Portal turret. I recommend using it only as a display trinket; it won't hold up to much play.

Step 23: Credits

These instructions were built in LDraw/MLCad, then screencapped in LDView and edited in Photoshop Elements.

Step 24: ...But What About the Laser?

Oh, right. You're wondering how I achieved the laser in my photograph? Don't worry, your turret won't actually kill you.

Materials needed for laser effect:
Laser light (warning: don't shine in anyone's eyes, etc.)
Misting humidifier or something else that creates a mist or fog

Step 1: Shine laser into turret's eye (it's okay, he can't be blinded)

Step 2: Fog up the area with the humidifier to make the laser visible

Step 3: Take picture

Here's my setup: challenge

Finalist in the challenge

MakerBot Challenge

Participated in the
MakerBot Challenge

Be the First to Share


    • Retro Tech Challenge

      Retro Tech Challenge
    • Robots Contest

      Robots Contest
    • Space Contest

      Space Contest



    Reply 10 years ago on Introduction

    We do what we must because we can.


    Reply 10 years ago on Introduction

    but there's no sense crying over ever mistake


    Reply 10 years ago on Introduction

    You just keep on trying 'till you run out of cake


    Reply 10 years ago on Introduction

    And the science gets done and you make a neat gun for the people who are still alive


    Reply 10 years ago on Introduction

    even though you broke my heart and killed me


    Reply 10 years ago on Introduction

    "And tore me to pieces"

    Thanks, all! Glad you like it. Feel free to continue the song ;)

    -Ryan H.


    Reply 10 years ago on Introduction

    As they burned it hurt because
    I was so happy for you!


    Reply 10 years ago on Introduction

    and we're out of beta we're releasing on time


    Reply 10 years ago on Introduction

    So I'm GLaD. I got burned.

    (so proud of you guys ^_^)