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16 votes
1 answer
930 views

How much tension can I expect to get out of a LEGO chains before it starts to give away?

Assuming I am using the Technic Chain Links to make a chain, how much force can I expect to be able to get out of the chain before it breaks? Suppose I am using a 16-tooth gear to directly drive a 24-...
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10 votes
0 answers
211 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 ...
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8 votes
0 answers
224 views

I got a vintage roof brick that is very nice but can’t find what it is?

I got these parts in a lot, but can’t find any history or brand or set on them?
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8 votes
0 answers
209 views

Are LEGO Quatro compatible with larger bricks? Soft Bricks or other?

There is a nice discussion here on LEGO+Duplo+Quatro compatibility. I posted what I found here where a LEGO storage block is the right dimension to be double a Quatro (4x Duplo, 8x normal). However, ...
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8 votes
1 answer
211 views

Motor problems in 60051

The motor in my High Speed Passenger Train set (60051) has stopped working properly. I just put brand new batteries in and it acts just like if they were worn. Moreover, the little brown capacitor ...
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  • 181
7 votes
0 answers
214 views

Digital tool for roller coaster physics

I'm currently working on a roller coaster MOC with a looping. I started physically building the MOC but quickly recognised that it is quite a mess to build something, tear it down rebuild it, etc. ...
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  • 549
7 votes
0 answers
156 views

Oil for old 4.5V motor? (UK)

I've just got my old LEGO Technic motor from my loft. It works but squeals in a way I don't remember it doing (35 years ago). I assume some lubrication would help and I've seen references to 3-IN-ONE ...
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  • 171
6 votes
0 answers
105 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 ...
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  • 4,649
6 votes
0 answers
153 views

Looking for a PC controlled motor that allows for very small and precise movements

The image below is a LEGO specimen stage designed for a stereo microscope. I am looking for a recommendation for a PC controlled motors that allows for very small and precise movements. I want use ...
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6 votes
0 answers
192 views

Was the color variation on 1970's transparent pieces really that bad or are mine unusual?

Having gone through a bunch of old 1970's Lego (I rebuild all my original sets during the Covid lockdown) I noticed that color-less transparent bricks and slopes have a lot of color variation to them. ...
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  • 1,170
6 votes
0 answers
192 views

Fix Lego M Motor - The hooks aren't budging

I have a Lego M motor that is broken. I'm following the instructions here to try to fix it but the little tabs that hold the plastic frame together just won't budge no matter how hard I'm pushing them ...
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  • 1,089
6 votes
0 answers
211 views

What is the number printed under the barcode of a Lego set?

I’ve got two sets of Lego Ideas #025 (steamboat Willie). They have the same barcode. Underneath the barcode there are some small numbers: one box has 118789 970, but the other box has 118789 017. A ...
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6 votes
0 answers
658 views

Building instructions: Robot Spider Pen by Ricardo Oliveira

Some time ago I found the following youtube video by Ricardo Oliveira of a small NXT plotter that crawls over a whiteboard. It has two strings that can be shortened through coils and with this, it ...
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6 votes
1 answer
229 views

Toa Terrain Crawler alternate build instructions

I was building the LEGO Bionicle Toa Terrain Crawler, (8927), when I saw at the back of the instructions a photo of an alternate helicopter-type build. Where can I find the instructions on how to ...
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5 votes
0 answers
146 views

How can I prevent rubber bands disintegrating?

These two answers partially answer this question., but I think it's worth its own question to find more options in a more comprehensive answer. Old Lego rubber bands are known to become brittle over ...
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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 ...
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5 votes
0 answers
220 views

Help identifying non Lego blocks

I'm in the UK. I've been given a box of old Lego bricks from when I was a child (80s). These were mixed in. I seem to recall they made a house perhaps? They are larger than Lego, smaller than Duplo (...
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5 votes
0 answers
182 views

what plastic is used in the floatable hull of 60266 Ocean Exploration ship?

I need to know what plastic is used for the hull (dark blue) of the 60266: Ocean Exploration Ship, in order to glue a reinforcement on. I bought this for my boys (younger than the advertised 7+). It ...
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5 votes
0 answers
216 views

Identify brand of these non-LEGO parts

I bought a bulk of bricks, some of them are not LEGO, but the quality is perfect - gloss, fit, plates have groove, transparent parts are clear. I would like to know which brand also produces such nice ...
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  • 233
5 votes
0 answers
93 views

How do I fix a loose joint between the top and bottom of the digger base?

How do I repair a loose-fitting joint between the top and bottom of the Duplo digger base? It has been used for only about a year. Is the wear more likely on the top or the bottom piece?
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5 votes
0 answers
68 views

Connectivity graph for a digital model

I'm looking for a way to take a digital representation of a model (e.g. an LDD or LDraw file) and extract from it a representation of the model that describes which pieces are actually connected to ...
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5 votes
0 answers
628 views

MouldKing set 13132 - Original design, alternate build or cloned MOC?

It seems that Chinese clone brand Mould King will be producing a new set that looks a bit like LEGO's Disney Castle set (71040). It has two times as many parts, however, and unlike LEGO's Disney ...
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  • 1,065
5 votes
0 answers
181 views

String thickness comparison

I am currently working on a project which uses a massive array of strings linking little levers. I am currently using the "thin" type string as it is the only type I have, but I am running into ...
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  • 393
5 votes
1 answer
238 views

Does anyone know what this piece is? 3224730, with a bar at right angles to two more-rectancular bits

I found this piece and don't have any idea where it came from or what it would be used for. The number "3224730 2" is stamped on the side. For scale reference, the long round bar portion ...
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4 votes
0 answers
172 views

Weird "reflection" when rendering on BrickLink Studio

When I was rendering my train MOC build, I noticed a weird "reflection" on every black piece. What is this? Are the resolution or quality too low?
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  • 111
4 votes
0 answers
103 views

How to pose figs in LeoCAD?

I’m new to LeoCAD. I find it’s easy to add regular minifigs or Technic figures to a model, but I can’t find a way to pose them. For instance I could build a car and add a driver, but the figure is ...
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4 votes
0 answers
170 views

Piece stuck in LEGO T-Rex body part nr. 6223585

My son stuck a rod piece through one of the openings in the T-Rex body middle part (part# 6223585). How can I open up the body to retrieve the rod piece? The body is made of two parts that are clipped ...
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4 votes
0 answers
193 views

What's this rod part?

Any ideas? I can't find a part number anywhere.
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  • 41
4 votes
0 answers
45 views

How do I sync audio and movement on my NXT 2.0?

How do I sync audio and movement with my NXT 2.0? I'm building an animatronic head and I can't find a good way to sync it with external audio because the internal speaker is too quiet.
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4 votes
0 answers
144 views

Migrate Lego Boost Android app data to another device

I have a Lego Boost Android application installed on device #1 and the app is logged into my LEGO cloud account (the same used for Lego Life etc. too) and is fully synced with cloud. On this device I ...
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  • 231
4 votes
0 answers
160 views

Repairing a 12V switch motor

My son caused me to dig up my old 12V lego trains. Surprisingly they mostly work, except for one part: https://www.bricklink.com/v2/catalog/catalogitem.page?P=70026&idColor=9#T=C&C=9 This is ...
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  • 141
4 votes
0 answers
271 views

Unknown Minifig Accessory (chrome silver/pearl gold)

I got a bunch of these in a bulk bin and cannot figure out what they are. It is possible they are not lego itself as I cannot find a lego logo on it anywhere. Anyone know what they are?
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4 votes
0 answers
440 views

Lego Mindstorms NXT 2.0 Not turning on

I have a Lego Mindstorms NXT 2.0, which worked well for a couple of years. However, after the last few weeks, it seems to not boot up. I took it apart, and noticed it seems to have a different ...
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4 votes
0 answers
250 views

Europe based printing services for low quantity high quality custom printed tiles

I've found many websites providing a service for custom printing of LEGO tiles : United Bricks Brick Engraver BrickSanity Fab-Bricks Citizen Brick EclipseGrafX Minifig Madness BrickTactical ... I ...
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  • 1,065
4 votes
0 answers
473 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 ...
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4 votes
0 answers
826 views

EV3 SPIK3R Mission 2 doesn't move

So I was building Spik3r and I thought I got mission 2 completed. Wheels are turning, legs are moving but the robot just does not move. It looks like the small wheels should be moving the robot but ...
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4 votes
0 answers
484 views

RCX + java + usb-to-serial

I am trying to get an old RCX working with leJOS. I already have it working with NQC and BricxCC. While NCQ/BricxCC seems to recognize my usb-to-serial (which appears as "COM5" to the OS), the leJOS ...
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  • 71
4 votes
0 answers
673 views

Daisy chaining EV3 with RobotC

I'm trying to run EV3 programs with RobotC and trying run on EV3 Daisy Chaining. I have three independent EV3 bricks labelled A,B,C. I want, according to the color reading by the color sensor on ...
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  • 295
4 votes
0 answers
504 views

LEGO turing machine using Rascal

I followed the instructions on LEGO Turing Machine and succeeded to build it. Next I've tried and failed to program it using NXT Mindstorm GUI. The site mentions a Rascal framework, but it doesn't ...
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  • 141
4 votes
1 answer
409 views

How to power up MOC-0308, based on Technic 8297 Off-Roader?

I have built the following MOC, with details here and here. It is pretty complete, although I would have tried some servo motor for steering. But after I've finished it, I've got into trouble: ...
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  • 503
3 votes
1 answer
87 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 (...
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  • 4,649
3 votes
0 answers
62 views

How do I copy blocks in LEGO 51515 block IDE?

I have been trying to copy and paste blocks in the new IDE that I downloaded from the Microsoft store (v 10.3.1). I do not seem to be able to copy block code from one project to another. How can I ...
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3 votes
0 answers
59 views

Are there any resources with 3D models of every Chima piece w/prints?

I'm looking for Chima pieces for a 3D animation project. Preferably compatible with Mecabricks. The characters in question do not matter though I would like if the resource had parts from an Ice Bear ...
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3 votes
0 answers
102 views

EV3 classroom cannot create New Project

EV3 Classroom V1.5.0 Windows 10 I run a lab of 24 laptops running EV3 Classroom v1.5.0. Over the last week, more and more computers are unable to create new projects and/or open existing projects ...
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  • 31
3 votes
0 answers
148 views

Mega Bloks Set Identification with large pieces AM09249 and AM09250

Does anyone know which set these parts are from? I have two of them. Labeled AM09249 and AM09250.
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  • 39
3 votes
0 answers
80 views

Is there a parts list for Light Stax pieces anywhere?

Light Stax is a clone product that focuses on electrically lit bricks. It basically works like the 1990s era Lego 9V connector plates - contacts embedded into studs and negative studs, so any Light ...
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  • 1,742
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 ...
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  • 4,649
3 votes
0 answers
89 views

Boost on laptop

How to manage the Boost set using laptop (with Windows)? It seems that the Boost Application for Windows 10 earlier available on Microsoft Store is no longer working: https://www.microsoft.com/en-us/p/...
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  • 83
3 votes
0 answers
72 views

Delete projects from Mindstorms EV3 Brick

I am using Lego Mindstorms with https://makecode.mindstorms.com/ and once the projects are downloaded to the brick, I cannot delete them anymore.
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3 votes
0 answers
43 views

Is it possible to convert .part to .dwg, and if so, how?

Is it possible to convert a Part Designer part (.part file) to a CAD file (.dwg, for example)?
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