Introduction: Lego Portal Turret

Picture of 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

Picture of Step 1

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

Step 3: Step 2

Picture of Step 2

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

Step 4: Step 3

Picture of 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

Picture of Step 4

Step 6: Step 5

Picture of Step 5

Step 7: Step 6

Picture of Step 6

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

Step 8: Step 7

Picture of Step 7

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

Step 9: Step 8

Picture of Step 8

Step 10: Step 9

Picture of Step 9

Step 11: Step 10

Picture of Step 10

Step 12: Step 11

Picture of 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

Picture of Step 12

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

Step 14: Step 13

Picture of Step 13

Step 15: Step 14

Picture of 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

Picture of 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

Picture of Step 16

Did you get the eye in? Great!

Step 18: Step 17

Picture of Step 17

Step 19: Step 18

Picture of Step 18

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

Step 20: Step 19

Picture of 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

Picture of Step 20

Step 22: You're Done!

Picture of 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

Picture of 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:


demonfox (author)2011-03-24


John Shepherd (author)demonfox2011-03-25

I'm making a note here


deadguy989 (author)John Shepherd2011-03-25

its hard to overstate my satisfaction

splinks (author)deadguy9892011-03-25

Aperture Science.

wsanriv (author)splinks2011-03-25

We do what we must because we can.

WakaWakaMan (author)wsanriv2011-03-25

For the good of all of us

Ssslouter (author)WakaWakaMan2011-03-25

except the ones who are dead

Bruno153 (author)Ssslouter2011-03-25

but there's no sense crying over ever mistake

ERCCRE123 (author)Bruno1532011-03-25

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

dombeef (author)ERCCRE1232011-03-25

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

pie R []ed (author)dombeef2011-03-25

i'm not even angry.

dombeef (author)pie R []ed2011-03-25

Im being so sincere right now

netnerd01 (author)dombeef2011-03-25

even though you broke my heart and killed me

L.D.M. (author)netnerd012011-03-25

"And tore me to pieces"

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

-Ryan H.

kathrynl (author)L.D.M.2011-03-25

And threw every piece into a fire.

Chowmix12 (author)kathrynl2011-03-26

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

John Shepherd (author)Chowmix122011-03-26

Now these points of data make a beautiful line.

Ssslouter (author)John Shepherd2011-03-26

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

demonfox (author)Ssslouter2011-03-26

So I'm GLaD. I got burned.

(so proud of you guys ^_^)

Bekahthepika (author)demonfox2011-03-26

Think of all the things we've learned,

junits15 (author)Bekahthepika2011-03-26

for the people whoa are still alive

netnerd01 (author)junits152011-03-27

go ahead and leave me
i think i prefer to stay inside

kathrynl (author)netnerd012011-03-27

Maybe you'll find someone else to help you.

Chowmix12 (author)kathrynl2011-03-27

Maybe black mesa!

ERCCRE123 (author)Chowmix122011-03-27

That was a joke. Haha. FAT CHANCE.

cowmanpoke (author)ERCCRE1232011-03-27

Anyway this cake is great. It's so delicious and moist.

wsanriv (author)cowmanpoke2011-03-27

This type of posts shows us that we are united, that we as DIY followers support each other, nice work people not only we have a great instructable here, but we have an active community

John Shepherd (author)wsanriv2011-03-27

Look at me still talking when there's Science to do.

Thanks for the C-C-C-COMBO BREAKER... We really needed that.

kathrynl (author)John Shepherd2011-03-28

When I look out there, it makes me GLaD I'm not you.

signposts (author)kathrynl2011-03-29

Just cause i love this game :P
I've experiments to run.
There is research to be done.

dombeef (author)signposts2011-03-29

For the people who are still alive,

dombeef (author)dombeef2011-03-29

And believe me I'm still alive, Also, when this sone is done, sticky it so no one can change it

I'm doing science and I'm still alive

PaulMakesThings (author)dombeef2011-03-30

And when you're dying I'll be still alive

rhrgrt (author)PaulMakesThings2011-03-31

And when you're dead I will be still alive

pinkblob (author)rhrgrt2011-03-31

still alive...
still alive.


dombeef (author)JonnyBrokenBones2011-03-31

Now the instructable owner should Feature this comment so it would not be spammed by trolls

splinks (author)dombeef2011-04-04


dombeef (author)splinks2011-04-05

Come on instructable owner... please sticky it

L.D.M. (author)dombeef2011-04-05

Okay. I'm new to Instructables, though -- how do I do it?

dombeef (author)L.D.M.2011-04-06

Press the feature comment button, thanks!

wsanriv (author)JonnyBrokenBones2011-03-31


valoskater8745 (author)wsanriv2011-04-05

Wow, that is possibly the best thing ever

kff96 (author)wsanriv2011-04-05

Standing applause!!

kgarthai (author)signposts2011-03-31

on the people who are still alive

wsanriv (author)kathrynl2011-03-29

Well I am GlaD i am a Freeman

Look at me still talking when there's science to do, when I look out there it makes me GLAD I'm not you.

chicopluma (author)junits152011-03-26

que vivan los legos yeah

Cavan the CM (author)2017-01-12

Well here we are again... (continue it ;D)

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