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:


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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