Questions tagged [building]

Interested in building techniques? Then this is the tag for you.

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8
votes
1answer
1k views

How many 2x4 Lego bricks would it take to build a real skyscraper?

As an exercise designed to communicate the scale of plastic waste in the oceans, which was estimated at 268,940 tons in 2014, I'm trying to describe how many life-size buildings one could construct ...
5
votes
2answers
321 views

How to locate pneumatic leak

I have a simple pneumatic claw with a 2 pump compressor that I built somewhat recently. It worked fine for a while, producing up to 4 bars of pressure, but then the system wouldn't increase the ...
14
votes
4answers
580 views

Any way to make this setup “tighter”?

I'm trying to build a robotic arm, and I had the following built so that there was the minimum possible movement created by the gear wheel (that connects to the worm). However, there is still play, ...
7
votes
2answers
5k views

Is this assembly legal?

This question might be strongly opinion-based, but I also think it might be interesting. I know there is a guide for Lego builders to decide if their build is legal or not. However, the cases of this ...
4
votes
3answers
250 views

How to eliminate a gap of an offset in a corner

So I need to build a layer with offset bricks, which I have managed to figure out. However, the corner is a problem. The dark bricks in my pic need to be in that position. How do I fill the gap ...
0
votes
1answer
53 views

My Mindstorms Spik3r can't turn around

When I use the button for turning it just goes backwards. Why does this happen? I've checked the instructions and didn't find anything.
12
votes
2answers
543 views

How to glue a LEGO tree decoration in a way that's not permanent, to prevent accidental disassembling?

I have a sweet LEGO Santa Claus and few other builds that would look cool as decorations on Christmas Tree. Sadly, it would probably break if I would try to hang it. It can stand all right but is not ...
0
votes
0answers
63 views

Temp Glue for LEGO [duplicate]

We have a Train Station Set, but this built is so loose and comes apart so easily thus it is really hard to move/play/connect to other parts. Is there some product like temporary LEGO glue to stick ...
4
votes
2answers
314 views

Which parts have no-friction Technic axle holes?

I want to make a no (or very low) friction inline coupling for axles. The axles must turn, transmit moderate torque, and be in phase (therefore backlash must be minimal). The axles remain inline at ...
13
votes
1answer
901 views

Why don't inverted brackets (99780) work in this SNOT 180 configuration?

I've been working on a MOC and tried using the following configuration of inverted brackets to achieve studs out SNOT 180 in a tight space: As you can see from the photo, this doesn't quite work. I ...
1
vote
0answers
69 views

All terrain crane 42082 [closed]

The wheels don’t go round after the first book is finished. Has anyone else had this issue? What did you do to fix it?
5
votes
2answers
2k views

How create a custom Roller Coaster? Where I can get the track pieces?

For some random reason, I watch some videos on YouTube showing a "Roller Coaster" built using Lego. I never enjoy to follow Lego instruction, and I always prefer to build something my own, mixing any ...
2
votes
3answers
153 views

Need help identifying a couple of Lego sets, grey tank with 4 short legs, and ship with long wings with lime green tiles

Do you recognize either of the below Lego sets? We received them as a hand-me-down gift with no instructions. Thanks for any help!
7
votes
1answer
355 views

Technic 8858 Rebel Wrecker alternate model impossible to build?

I don't mean "difficult", I mean it appears to have an actually impossible instruction. Or am I missing something obvious? Here's the deal (pardon my lack of standard names for parts): I recently ...
10
votes
0answers
300 views

Step 160 on Carousel 10257, white hinges not connecting?

I'm struggling with step 160 where I use white "hinge" connectors to connect the carousel platform sections. It seems to create too much pressure and the platform breaks apart. Grateful for any tips.
2
votes
2answers
142 views

Lego identification help! Red torso, lightsaber handle, and grey pieces?

What does this build? Can anyone help me with the instructions link?
52
votes
5answers
12k views

How do I center a 2x2 plate on a 3x3 plate?

I want to be able to center a 2x2 plate in the middle of a 3x3 plate - specifically to put minifig on. Another option would be to center a 2x1 plate on a 3x1 plate.
6
votes
1answer
221 views

Good “freeware” mosaic creator

I need to know of a decent "freeware" program that can take an image and turn it into a full color mosaic. It also needs to have a part count/listing.
6
votes
2answers
1k views

What are some LEGO Christmas trees designs I can build?

It's Christmas time, and I'd like to build a Christmas tree to add to my winter scenes. Unfortunately the large LEGO pine tree is a little small, and also doesn't offer much by way of decorating ...
1
vote
1answer
226 views

Issues with set 10234 book 3 pg 43

The white wing-like piece continues to pop off when placed. Has anyone figured out a fix for this or am I doing something wrong Instructions 3 & 4: src: http://lego.brickinstructions.com/10000/...
8
votes
1answer
105 views

Are there any wheels or rings that fit in pin clips?

I was experimenting with Lego part 16091 Vehicle Steering Wheel Small and various clips, mainly the ones that fit onto bars. To my frustration I found that the clips do not engage at all with the ring ...
3
votes
1answer
238 views

How to visually search for specific parts in a 3D model?

For a missed/loose piece that needs to be reattached, I plan to check all the steps where the piece was used. If I can also get an overview of the possible piece locations from the existing 3D models, ...
4
votes
1answer
2k views

How to connect chain links in LDD to make tank tracks

I need help trying to connect chain links (in LDD) around a set of idlers and drive wheels. This is to be used on a tank design, and therefore is not using actual chain. It is using "Chain Link m=1" ...
6
votes
3answers
5k views

Does knolling help or is it just part of the fun?

When building a new set, many people knoll their LEGO bricks before beginning the assembly. My question is: Is there a actual advantage to knolling all the pieces or is it only a way to stretch the ...
6
votes
4answers
8k views

How to put LEGO together upside down

I'm building a truck. For the transmission, I want to make it all even and symmetrical. To do that I need the pieces to stay together but they have no studs connecting so they will just fall apart. ...
7
votes
1answer
163 views

How can I firmly attach a Technic triangle to a turntable?

I found a couple good technic triangle designs over on brickengineer.com. For example: How can I firmly attach a triangle to a large turntable? Details: Really I only need to attach ...
4
votes
2answers
176 views

Best Way To Make This 8x8 Grate Plate Flush With The Wall?

I would like to use the 8x8 grates on the side of the building (studs out) as window pieces so there is nothing behind them. I'm wondering if there is a better way to have a more stable connection. I'...
8
votes
2answers
375 views

Has the building technique of Technic pins in a brick cylinder been used in an official set?

One of my favorite building techniques is to place a Technic pin into the anti-studs of a brick. This allows two bricks to attach bottom-to-bottom. It's a pretty secure connection, but I'm not sure ...
13
votes
2answers
2k views

How is this kind of structure made?

Recently I found a MOC made by Headzsets from Instagram, in particular this interesting structure from his EVA work. Here is a picture of his structure: (https://www.instagram.com/p/BtCymDRHJx6/) ...
3
votes
1answer
146 views

Lego Classics alternative

I've been looking at buying one of the classics sets for my young kids. My desire was to have a large collection of bricks that they could build houses/cities/etc with. I thought that the Classics ...
5
votes
1answer
295 views

Trouble with 42110 Land Rover Defender transmission

I just got the 42110 Land Rover Defender and assembled bags 1 and 2. I tested everything before joining the front axle and rear axle, and the friction was quite low, not nearly high enough to get ...
5
votes
2answers
65 views

Going from LDraw/LeoCAD to Physical Set

Once I've designed a MOC using either LDraw or LeoCAD where can I go to get the bricks I need to then build that set in the real world? I've been poking around forums for an hour now trying to get ...
3
votes
1answer
229 views

How to build a waterproof roof out of LEGO blocks?

How would Lego blocks be tiled to provide a water proof roof against the rain? The lattes or internal support structure of the roof doesn't have to be also made of Lego. Basically the tiles on a roof ...
6
votes
8answers
39k views

LEGO ideas (with traditional bricks)

I would like to find a large catalog of LEGO designs/ideas that can be built with "traditional" LEGO bricks (both normal and DUPLO). I have found many nice designs in the web, but most of them ...
8
votes
5answers
1k views

How can I make my robot heavier?

I'm building a 3kg LEGO EV3 sumo robot and I need to make it as small as possible. Which LEGO items do you recommend to add more weight on it? (tires, plates, wheels, blocks, minifigs etc.)
4
votes
1answer
175 views

How to ship a LEGO sculpture to a contest?

I am planning to participate in an art contest that allows paintings, sculptures, or video clips. I have a LEGO sculpture in mind that would fit the idea of the contest, but it would have to be ...
15
votes
1answer
2k views

How can I make a precise one-way clutch using Technic elements?

I need a mechanism so that if a (NXT) motor rotates forward, it moves one gear, but the other stays still, but if it rotates backwards, the first gear does not move, but the second one does. I found ...
5
votes
2answers
456 views

Large trap door - alternative to door with frame 4595708

I need to build a large trap door, the trap door 4x5 with frame 6x8 is too small for my model. Other doors/hinges seem to have too much resistance and the door doesn't fall by itself, it must be ...
15
votes
5answers
68k views

What is the quality of lego replicas on Aliexpress?

Aliexpress sells a lot of Lego replicas, has anyone here bought one? I am wanting to know how the quality compares to Lego? Example products: https://www.aliexpress.com/wholesale?catId=0&...
2
votes
1answer
97 views

How to make a RPG (Rocket Propelled Grenade)

I don't know if this is of-topic or anything, but: I have a big scene with cops and stormtroopers fighting. And the cops need some stronger weapons than some sub-machine guns. So i was wondering if ...
8
votes
4answers
496 views

City scale connection for five-bladed helicopter rotors

I want to build a Super-Puma helicopter in city minifigure scale and form, I have the basic design planned, but I am not familiar with any five-sided technic connectors, which I will need for the ...
-1
votes
1answer
97 views

Ideas to help develop a child's engineering skills?

My son is 7 yrs. old and has really creative ideas with his bricks. I see it challenging him and wonder, "How can I help develop his product engineering/design skills?" What kind of tasks can I give ...
2
votes
1answer
184 views

70728/2 Ninjago piece too short?

My son is putting together the 70728 set and the grey tall pieces in book two at step 8 seem to be too short, they leave a gap. By about a mm. Has anyone else had this experience?
1
vote
2answers
120 views

Looking for sets with lots of printed parts or other special parts to use as components for my city

I'm thinking about building an early 20th century ('30s / '40s) European city, using both complete sets and parts of sets as resources I'm looking for pieces that add detail to this city, both ...
3
votes
2answers
16k views

I'm looking for a good LEGO Modeling Program

I've seen people use those programs that model out your own LEGO design so you and others can see how it would look. Can I get a list of a few? Free and safe are preferable. Thanks!
4
votes
0answers
227 views

Building techniques for designing a LEGO City Street scene?

As the question suggests... I'm trying to build a city street in "midiscale" similar to that of Hong Kong, but I have no idea on where to even begin with something like this. This project is being ...
4
votes
0answers
189 views

How to build an arch that is angled out of Lego?

I am currently working on a MOC for the USS Orville and I am trying to figure out the engines. I have gone through a couple of iterations on my current version, but it always buckles under its own ...
4
votes
1answer
231 views

I'd like to build a mechanism to press buttons on a remote control. What is a good basic approach to use?

I have a small remote control like device with about 11 buttons. The centers of each button are placed about 1.1cm apart, and each are about 0.7cm in diameter (this means about 0.4cm between the edges)...
5
votes
1answer
177 views

What techniques can be employed to build a low-profile sliding door/wall?

I'm looking to build a sliding door or wall that doesn't use the defacto "sliding door" parts, 2874 and 4511. These parts are almost usable for my design: they are thin and have a built-in stopper ...
1
vote
0answers
52 views

Custom extension cables for Light Stax?

Recently, I got the S-12012 Light Stax kit with 50 (!) light bricks. They are different from those described in this question, but they are much cheaper, colorful and with blinking/pulsating effects. ...

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