Introduction: Full-size Lego Space Helmet

Picture of Full-size Lego Space Helmet

When I was growing up the vintage Lego Space sets were my favorite. This past year, The Lego Movie featured some of these old-school spacemen. I've always loved their iconic cylindrical helmets. I thought it would be cool to make a full-size, wearable version of the helmet worn by the Classic Lego Space minifigs.

For the Lego nerds: The Classic Space Helmet has actually gone though a few modifications over the years. The character Benny from The Lego Moviehas a cracked chin strap because the original late 70s helmet design was notorious for breaking. They thickened the strap on subsequent designs. Mine is going to be the original design – sans crack.

I took careful measurements of one of the helmets I have from my childhood Lego sets. The helmet is essentially 1:1 tall and wide. I scaled that up to a size that would look proportionally correct on my head.

Step 1: Supplies

Picture of Supplies

Plastic Mixing bowl with 10" diameter

12" Cardboard concrete foundation form – I had to cut and reduce the diameter to 10" for my mold.

Smooth-on 300 resin casting kit

Bondo automotive body filler

Automotive body spot putty

Rustoleum 2x Primer

Rustoleum 2x Red Paint

Rustoleum 2x Clear Gloss

Sandpaper: 100grit, 250 grit, 800 grit

Rubbing compound and Polishing Compound

EVA floor matts

Step 2: Create Main Cast

Picture of Create Main Cast

First, to create the mold for my resin helmet, I found a plastic mixing bowl that had the correct diameter and curvature. For the cylinder part of the helmet I used a cardboard concrete form from the hardware store. These were measurers carefully and hot glued together. I also added a piece of EVA foam on the inside that will create an indent to mark the open visor area. This creates a quick mold to dump resin into.

After coating the inside of this with mold release I slush cast Smooth-on 300 resin into the mold. After about 6 coats of resin I was able to pop out a white helmet to begin finishing!

You could create a "master" helmet a more conventional way out of clay or Pepakura. I chose this way because it got me a resin master that would be perfectly cylindrical very quickly.

This white resin master was touched up with Bondo to smooth out the surface.

Step 3: Adding Details

Picture of Adding Details

The entire helmet was primed with matte auto primer and sanded and filled with spot putty to get the surface smooth.

The little dimples on the side of the helmet were created by drilling 3/4" holes in the side of the helmet. From the inside I glued small 3/4" PVC caps. The edges were smoothed with Bondo.

The rim around the visor area was also smoothed out with Bondo.

Step 4: Paint

Picture of Paint

The visor area was cut out of the helmet with a Dremel.

The entire helmet was again primed, and painted with Rustoleum 2X Red.

Step 5: Interior Liner

Picture of Interior Liner

I wanted to create a "finished" look to the inside with a sort of liner. The product I worked with was EVA foam floor matt. The top dome area was covered with a disk of the foam by heating it with a Heat Gun and form it into a bowl to create the form.

Step 6: Finished

Picture of Finished

The final helmet turned out quite well. I'm thrilled that the proportions seem very close to the actual helmet. It's "wearable" but not for very long. It tends to rotate, because my head is not a cylinder. The yellow face visor is a Photoshop mockup. I plan on creating a removable yellow faceplate.


MystrEggnuts (author)2016-07-26

Hey one question?

What about a see through visor for the hemlet

LaurieS19 (author)MystrEggnuts2016-10-11

The visor would just get lost. All mine did... *sigh*

Command-A (author)2015-05-23

If that was a pasta bowl, you might be.... pastafarian

DaddysGal22 (author)2015-03-11


DaddysGal22 (author)2015-03-11

I couldaa....I couldaa daa.......

DaddysGal22 (author)2015-03-11


Mrfang2 (author)2015-01-28

Hey, would it ever be possible to commission one of these from you? I've got a convention coming up in a few months, if you still have the mould you used for this would it be possible to get just the outside of it, without you having to paint it or do the foam inside?

sradtke (author)Mrfang22015-01-28

Hey there. thanks for your message. I never actually did a mold. My helmet was a one-off. I would need to create a mold. Which is certainly possible. Do you have a budget in mind?


Mrfang2 (author)sradtke2015-02-18

Does someware around 60-65+shipping sound reasonable?

sradtke (author)Mrfang22015-02-18

Hi, I sent you a private message several weeks ago with pricing. Check your inbox and let me know if you have questions.

Mrfang2 (author)sradtke2015-02-18

Oh? Sorry! I'll go check it now!

Mrfang2 (author)sradtke2015-01-28

I've actually not ever commissioned a part for cosplay before so I don't have a set price in mind, I'd say someware in the 60's plus whatever shipping would be, but I have no clue if that's reasonable, if it isn't just say so and I'll see what I can do? Sorry, this is only the second cosplay I've actually ever done, so I'm a bit of an idiot about this stuff, the price of materials and all that.

andy.knote (author)2014-12-30

Awesome! Great instructable. Great photos, great tep-by-step. Nice work!

dimdiode (author)2014-11-27


krummrey (author)2014-11-24

In my mind I was flying through the universe with Lego-Space.
Now I can again. Thanks you.

The Rambler (author)2014-11-24

This looks amazing. I love classic legos so naturally I'm a fan of this build but I also love how you made the mold. That was genius.

askjerry (author)2014-11-23

I don't have a word for how awesome that is... language fails me.

kylegilbert (author)2014-11-23

Love it! So nicely done!

jayjay36 (author)2014-11-23

Everthing is awesome!

BigBearHostel (author)2014-11-23

Just paint your face yellow. I think that would be funniest.

gigin (author)2014-11-22

Thank you for sharing...

gigin (author)2014-11-22

Thank you for sharing...

gigin (author)2014-11-22

Thank you for sharing...

phil.wieser (author)2014-11-21


kakashibatosi (author)2014-11-21

Great job! I could see fitting this with impact padding and getting it rated for motorcycle use. It'd definitely make you unique. If you make the face plate see through (possibly with mesh?) you'd have a really unique costume for halloween or conventions!

XaqFixx (author)2014-11-21

THANK YOU FOR THIS!!! I did a lighted (Blue LEDs in helmet and on chest) Silence in the Library (Doctor Who) Lego Spaceman costume this year but the top of the helmet was a last minute rush job. This will be a big help in completing it properly.

Doc Honey Badger (author)2014-11-21

Easy way to keep it from moving... Add a chin strap

Jobar007 (author)2014-11-21

That looks pretty slick. If you wanted to make this more wearable, maybe go with a suspension liner on the inside? That way it stays attached and centered on your head with little additional weight?

jarekdziubas (author)2014-11-21

It looks really great :D

tomatoskins (author)2014-11-20

Well, that just turned out great! I love how authentic this looks! I've never used Smooth Cast before, is the result very heavy? You mentioned that it likes to rotate a bit when you wear it, I can see that. Any plans for creating some other sort of lining (maybe someting like a bicycle helmet) that could hold it in place?

sradtke (author)tomatoskins2014-11-20

SmoothCast is my go to. It's lightweight and simple to work with. No plans for a more wearable liner. Honestly, this is more for the novelty of having the helmet in my office :)

tomatoskins (author)sradtke2014-11-20

Hmmmm.... I'll need to check it out for future casting projects! Thanks for the info!

Tomahawk92 (author)tomatoskins2014-11-21

I made a helmet type mask before and I got some Styrofoam and very thick sponges that I glued onto the inside, its comfortable over long periods of time and its snug enough to move with your head so it won't rotate unless you do.

Ayush Sharma (author)2014-11-20


JM1999 (author)2014-11-20

You forgot the crack in the mouth guard!

geeklabs (author)2014-11-20

this is great detailed work. thanks for sharing. also, my friend did a lego mask, and used a window screen for the face. he sprayed painted it yellow, and painted the eyes and smile. when worn, you can see outwards, but people can't see inwards.

About This Instructable




More by sradtke:Mega Man 8-bit Mega Mural from Ceramic TilesBatman Arkham Knight Utility BeltFull-size Lego Space Helmet
Add instructable to: