jncraton
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What is this light grey LEGO plate with six sides (hexagon)?
57 votes

Informally, it's known as the Nexogon. Bricklink calls it "Plate, Modified 6 x 6 Hexagonal with Pin Hole". The part number is 27255. It's original use was as a shield in the Nexo Knights line in 2017,...

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What different types of LEGO train tracks exist?
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46 votes

The main LEGO train systems are all roughly compatible. They all use a 6 stud gauge, so with a bit of fiddling, you can use all of the systems together. If you want to be most compatible with the ...

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Can the new road plates be used to build ramps or hills?
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37 votes

I tried this out recently with the new road plates. Because the new system is composed of proper plates with connection points on the underside, this is fairly simple to do. It really comes down to ...

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Are all of these police minifigs from LEGO?
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35 votes

As pointed out by others, the first three minifigures are genuine LEGO (with the second having perhaps a few custom accessories). The fourth is not a LEGO minifig. It may include some genuine LEGO ...

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How does the LEGO Super Mario figure know which power up is attached?
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34 votes

The Mario element has six switches on the front: The inside of the pants in the power-up sets include six plastic ridges that can be either high or low. They interact with the switches on Mario's ...

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A technology building set that is not LEGO Technic, K'NEX, or Meccano. Can you help me with the name?
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30 votes

Based on your description, this sounds like Fischertechnik:

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What is this small space-themed set from possibly the early 90's?
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29 votes

This is most probably Ice Planet Scooter:

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Why can't I reproduce this SD card box in LDD?
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29 votes

The issue here is that the hole in a Technic brick isn't at exactly the same height as the stud on the side of a System brick. Here's a slide from a great presentation which explains the details: ...

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Need help to identify a piece - green, like a 1x2 plate with 4 angled cubes hanging off at odd angles
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28 votes

That's a Creeper torso (officially 19734 Creature Torso Blocky with Cube Feet). If you're familiar with Minecraft, you'll probably recognize it once you know the context:

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Stained glass windows on The Throneroom of Cedrica
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28 votes

I see that this popped up on HNQ, so I wanted to expand on shoover's excellent answer with a build showing one way that this could be put together for folks that may not be as familiar with LEGO ...

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Why does BrickLink append a -1 to so many set numbers?
26 votes

TLG hasn't always been particularly careful about their set numbering, so the community has taken to adding -1 to the end of the set number to handle cases where there may be duplicate set numbers ...

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Are there any LEGO base plates that are compatible with Duplo?
24 votes

A regular LEGO base plate will work with DUPLO bricks. As demonstated in this question, the two systems are compatible in a number of ways. Here's an example of System base plates with DUPLO bricks ...

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Why are there "unique" characters in many sets?
22 votes

It seems like you understand why there are unique minifigs, but I'll point it out explicitly anyway. Unique minifigs add character to sets, and add to playability. For example, I always wanted this ...

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Can anyone identify this brick?
21 votes

That's 32177 Technic Beam 1x7 with Fan.

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Is there a freely downloadable LEGO set and part dataset?
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20 votes

I wasn't able to find anything like this, so I contacted the admins of the sites that I mentioned in the question. Rebrickable was kind enough to send me a dump of their set inventories under a ...

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Are there any Star Wars vehicles that have not yet been produced in a Lego kit?
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20 votes

As far as I know, all of the most common vehicles have been produced, but I could be forgetting something. There are many obscure vehicles which have not been produced, but I don't see any reason to ...

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How can I make church bells with a pull cord?
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19 votes

It sounds like you're trying to implement a fairly simple bell mechanism such as this one: You can certainly do this using some string and the pulley element that you mentioned. I'd recommend tying ...

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What is the purpose of this plate with door rail?
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19 votes

These pieces are frequently used for decoration now, but they were originally used for sliding doors, particularly on train sets. Here's one of the first uses from set 7838 in 1983: While they could ...

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How is the roof on this bridge town formed?
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18 votes

At first, I assumed that this was a clever technique using something flexible like a net or tubing. After a bit of digging, I found a similar tower roof on a different build by the same person: ...

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What can this curved brick with square holes be used for?
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18 votes

The part is Window Round 3 x 3 x 2 (73878). It was a new mold for 2021, and one of its first uses was as windows on Andrea's House (41449). This piece can be used on buildings anywhere you'd like a ...

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Attaching a ring-like handle to a castle door
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18 votes

I agree with Alex. There's no reason to settle for a ring, when you could use the ring. Here's one way to attach it if you want the ring to look like it is hanging down from the door:

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Is it legal to sell your mocs?
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18 votes

Selling used LEGO is definitely legal, at least in most legal systems. One of the most basic property rights involves the right to transfer ownership as long as both parties agree on the terms. Even ...

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How to fill a vertical 1.5 stud wide gap?
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17 votes

Before I attempt to come up with an answer, let me share how I think through problems like this, as it might make it easier for others to solve problems like this in the future. We can see that the ...

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If I were to make a LEGO fan how would I make it blow air on me?
17 votes

The easiest way to do this would be to use a motor with a high speed (or gear up a lower speed motor) and then attach one of the larger propeller elements to it. You can probably build a custom prop, ...

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Is there an API for the Duplo 10874 train set?
17 votes

There is now official documentation for the Bluetooth protocol used by the Powered Up product line: https://github.com/LEGO/lego-ble-wireless-protocol-docs The community has created some tools to ...

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What is the centre hole for in modern train tracks?
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17 votes

The larger hole is present in older 9V track as well: I've never actually done this, but I've always assumed that the hole is there so that the track can be screwed or nailed down if desired to ...

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What parts are these (showerhead)?
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16 votes

I believe that this is 65578 attached to an angled lightsaber hilt and a light reflector dish.

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Why do some minifigs have grey hands and some yellow?
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16 votes

Hand colors other than yellow are generally used to either match skin tone in licensed themes, or to represent some sort of gloves. The police officer you mentioned is probably "wearing" some sort of ...

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What element is this a piece of, and how can I repair it?
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16 votes

It's difficult to tell exactly what part this fragment came from, but it looks like it is part of a broken Technic gear or pulley. It looks like it probably came from 3736: Your fragment looks like ...

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Identify rug pieces in this library scene
15 votes

It's hard to tell for sure, but I believe that it is Bar Holder with Clip (11090). The size and shape look about right to me, and it is widely available in those colors.

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