Questions tagged [building]

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

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4 votes
2 answers
139 views

Plate perpendicular to bottom of square brick/plate: is this connection legal?

This is closely related to the question about jamming plates underneath 2x2 round bricks, (and indeed prompted by a comment there), with differences explained later. It is possible to attach a plate (...
-4 votes
1 answer
36 views

How to connect together 2xBar 4L parts [closed]

I want to build monorail MOC minifig, and I need to connect 2xBar 4L parts together to make rails, but I don't know how to make it, and I need to exclude stopping monorail.
1 vote
0 answers
50 views

42131 Bulldozer Testing [duplicate]

Got to the testing page and everything is working correctly except the left track is going in the opposite direction to the app animation. Should I start again?
6 votes
0 answers
114 views

Plate perpendicular to bottom of 2x2 round: is this connection legal?

I've played enough with 2x2 round plates and 1-stud-wide plates to know that it's possible to attach a plate underneath a 2x2 plate and perpendicular to it, like so: The same connection is possible ...
5 votes
1 answer
484 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
1 answer
203 views

I am building the LEGO 42131 D11 dozer and some of the parts are moving in reverse when testing

I am building the D11 dozer and some of the tests like 2 and 4 are moving the parts in the opposite direction that they are supposed to be going. I took apart the entire build and rebuilt it and the ...
2 votes
0 answers
73 views

I just finished the typewriter set and everything works fine but the type-bar is a little higher than it should be. Is there any way of fixing it [closed]

The typewriter works perfectly fine. The only problem is the typebar being a little higher than it should be.
3 votes
1 answer
255 views

Technic pin on a pole: is it an illegal technique?

I have two 2714b pieces that I want to put together to make a longer pole. Is sliding the technic pin of one pole over the end of another pole illegal? (If it is, how else could I make a long and thin ...
1 vote
0 answers
73 views

Power from single XL-Motor to both rear and front axles [closed]

I have a single XL motor and I would like to make my small car a 4WD one. Currently, it is just front-wheel drive. Any good instructions on transmitting power to rear wheels as well?
7 votes
1 answer
262 views

5x3 Half Round Problem

How can I hide on top of this with tile pieces? To make it like this: //Edit Thank you for the solution @jncraton Before answering I made it like this: But now it looks way better and it will be ...
13 votes
1 answer
1k views

Mechanical auto-unblocking mechanism

I have a GBC module1 which is quite simple but blocks regularly because a ball happens to be at just the wrong place at the wrong moment. Per se, it's not a problem as a Technic Gear 24 Tooth Clutch ...
16 votes
6 answers
5k views

Estimate building time for a given LEGO set

I'd like to be able to estimate better how much time a LEGO set will take me to build. Are there any resources online that indicate average or fastest building times for a given set? I suppose it also ...
5 votes
1 answer
466 views

42082 crane boom doesn't engage

At the top of the sleeve part of the boom is a gear and that is supposed to turn against a rack of teeth all along the inner slide part of the boom extension, to make the boom longer or shorter. ...
4 votes
1 answer
154 views

Lego rough terrain 42082, page 57 book 1 - how does it connect internally

Is the dole meant to connect to another cog inside so all the gears rotate the big round cog on top (Image from brickinstructions.com)
19 votes
1 answer
5k views

What would be a simple trebuchet design at the Minifigure scale?

I would like to have a trebuchet design at the Minifigure scale and simple enough for kids 10+ to build. Note 1: The counter weight can be any non-LEGO heavy object. Note 2: On top of the standard ...
5 votes
0 answers
301 views

How do I build my LEGO slope so it connects to the flat top without any notable ridges?

I'm currently building a functional LEGO escalator that is minifigure-scaled and with staircases transitioning from flat platform to stairwell to flat platform. Here's my progress so far: Here's the ...
9 votes
2 answers
566 views

How can I build a Lego slope of this exact angle with ideally only legal techniques?

I'm currently building a functional Lego escalator that is minifigure-scaled and with staircases transitioning from flat platform to stairwell. Here's my progress so far: But with the design of the ...
3 votes
1 answer
277 views

Piece in Lego 21327 Typewriter Step 26 can’t be flush as depicted in the illustration

When sliding part #6327028 down the left three rods as depicted in step 26, that piece becomes snug with the gray spacer piece from Step 25, but there’s a gap on the two left rods. The 1x5 black ...
9 votes
4 answers
601 views

Combine Duplo feet with regular LEGO

I would like to place this Duplo pig directly on Lego bricks/pieces. I tried an intermediate Duplo 2x4 plate with Lego bricks underneath, but it doesn't look good. The problem is that Duplo feet ...
10 votes
0 answers
212 views

How To Ensure Only One Brick is Fed Into a Lego Sorting Machine at a Time?

In this video, they create a machine that can take a bunch of legos put on to a conveyor belt and, using a camera, sort them into a number of categories. I am building a (smaller) version of this, and ...
5 votes
1 answer
388 views

Any cheap Technic sets with a good variety of parts?

I want to start building a module like GBC Miniloop 01, but when I check the part list some are very hard to find. How should I get started with miniloops? BTW, I got a very big set, Bucket Wheel ...
4 votes
1 answer
277 views

What is the power of Lego Powered Up motors (M, L, and XL) and the Move Hub motors?

I am trying to build a setup that includes two propellers that can pitch up and down. I am debating whether I should use two motor to power each propeller and the other two to act as servos for each ...
11 votes
1 answer
2k views

Cargo bike brick identity

Looking to identify the box pieces here:
24 votes
7 answers
11k views

What techniques can be used for laying plates at 45° angle?

I've seen a number of techniques for laying individual elements at 45° angles, but I need a consistent method for laying down larger plates at 45 degrees while maintaining close contact with the base ...
3 votes
0 answers
121 views

Attaching a laptop to a table

I want to give my minifigs a few laptops. Specifically, 62698 "minifigure utensil, laptop"s: I've seen laptops in sets and MOCs, but always either (a) closed, being held in a minifig hand ...
-2 votes
3 answers
259 views

Why does this "useless machine" use out of production parts?

I found this new video. It uses out-of-production parts like the transmission parts. So when I tried to buy these elements in new Technic sets, I didn't find some of them. Any suggestions please?
18 votes
4 answers
2k views

How can I get my motor to line up with a linear actuator?

I am very new to Lego, and I want to create a simple horizontal sliding door. I'm using a medium linear motor to drive a linear actuator which is attached to the door. The problem is the motor does ...
14 votes
1 answer
1k views

How does the LEGO Typewriter mechanism fit?

My wife is building the LEGO Typewriter set (21327). When she installs the gearbox mechanism at step 210, the whole thing jams when pressing the keys. I am trying to help her and have "unbuilt&...
5 votes
1 answer
478 views

LEGO Bugatti Issues

This is my first post and my first LEGO set. I recently built LEGO Bugatti Chiron with all the features working. I am however having an issue with the rear axle/wheels. The rear brake calipers fall ...
14 votes
5 answers
2k views

How does the Space Shuttle dock the ISS?

The IDEAS International Space Station (21321) comes with a miniature model of a space shuttle. And while that has its place on the space station's stand, the official LEGO product page literally ...
5 votes
1 answer
256 views

Saturn V build step 124

Step 124. Having some difficulty from the diagram figuring out how to orient each of these four pieces. Can't figure out if the light grey nozzle is suppose to snap into the bracket shown in step 123. ...
8 votes
2 answers
526 views

Align 2xX plate on "sandwiched" brick (height of 5 plates)

I'm using "baseplates" for my builds which are built by using two 16x16 plates with one brick height between them (to connect multiple baseplates with Technic bricks and pins). Now I'd like ...
19 votes
1 answer
2k views

How is the roof on this bridge town formed?

I recently came across this build from Markus Rollbühler: It includes many great details and building techniques. I'm curious how the conical tower roof is formed, though: It's obviously made using ...
1 vote
5 answers
2k views

What is the largest number of pieces in a set for LEGO, Nanoblock, or any other brand?

What is the largest number of pieces in a set for LEGO, Nanoblock, or any other brand? I recently bought a 6800-piece LOZ Block set (Chinese Nanoblock knockoff). I was wondering if there are sets in ...
2 votes
1 answer
180 views

Box seals: Two arrows instead of 4-digit manufacturing code, is this a fake?

I have bought a lego architecture 21001 "John hancock" from a website.But as the title, there is no 4-digit code on the sticker. Could you guys help check if the stick is not the original ...
-2 votes
1 answer
197 views

Creating client logos and buildings

My colleague and I are looking to give our smaller customers a custom built company logo out of LEGO, and our 3 largest customers a model of their entire building. Can you give us some pointers on ...
8 votes
2 answers
2k views

Insert a gear into a turntable?

Is there a way to insert a 24 tooth gear into a turntable of the 48452cx1 type? --> Is there any model to feature any tooth gear (even smaller) used inside this turntable? This specific ...
6 votes
2 answers
240 views

How can I build the windows depicted in this image?

I am trying to figure out the building technique used in these windows. Does anybody know how to achieve those? Unfortunately I do not have pictures of the lower part. Edit: I only want it to look ...
2 votes
1 answer
159 views

Where should the 76139 Batmobile roof pins land?

Lego Batmobile 76139. Could someone please advise whether the pins installed in step 445 should rest on top of or just in front of the stanchions installed in step 417 ?
12 votes
4 answers
13k views

Are BanBao bricks compatible with Lego?

Does anyone has experience with BanBao bricks? BanBao World Are they compatible with Lego bricks? They have basic sets and plates which are at a good price.
4 votes
1 answer
211 views

What is this right angled piece with clip and how can it be used?

What element is this? What can it be used for?
68 votes
4 answers
11k views

Is it possible to build simple logic gates with LEGO mechanics?

I built a simple bitshifter in Minecraft yesterday. I wondered if something like this could be built with LEGO? Maybe there is a possibility to build gates with rubber bands and those movable ...
5 votes
1 answer
115 views

Question about Batmobile 76139 build

What's the purpose of the hinge plates in Step 133? I ask because it got in the way when installing the side sections in Steps 222 and 231. I simply pushed it out of the way and everything was OK. ...
13 votes
2 answers
684 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.
8 votes
3 answers
609 views

Alternative ways of attaching roller coaster wheels

While doing a bit of research about a mine track related question, I noticed that part 24869 "Wheel Roller Coaster" is meant to be used only with part 26021 to form a form a specific ...
8 votes
2 answers
975 views

Minimal mine track

I want to create a mine scene on a 32x32 baseplate. I want to run a train track across the front, and then about 12 studs into the mine. Then, I want to build a couple simple mining carts on the ...
5 votes
3 answers
3k views

Is there a 90 degree angle brick?

Is there a brick that I can use to connect LEGO plates at a 90 degree angle?
3 votes
1 answer
169 views

Building a window with the tie-fighter round dish

Is there an elegant way to build a round window with the Radial Cockpit Window? I've tried experimenting with vertical clip plates but it just ends up looking odd.
7 votes
1 answer
7k 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
2 answers
114 views

What does 18853 (Friends flower) connect to besides 37695 (Plant stem with 3 leaves) or 11609 (Friends accessories star)?

What does 18853 (Friends flower) connect to besides 37695 (Plant stem with 3 leaves) or 11609 (Friends accessories star)? Is there a good way to attach it to common plant stems (3741) like this one:

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