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v=SRP8HcEaRpQ Or if you'd prefer to have spiral staircases and have lots of turnplates you could try building one according to this video: https://www.youtube.com/watch? …

You could introduce an arbitrarily sized gap between the red and yellow bushes in the depicted design, thus forcing the other yellow bush and the black gear against the frame. If this gap collapses du …

The answer depends on your definition of "legal". In the strictest sense, it means "can be used in official LEGO sets", and in this case, this is definitely not legal, as the axle is not designed to b …

You can build your own trap door from System and Technic pieces. Use plates for the surface and frame (maybre reinforced by bricks if necessary), and attach one or more (depending on the weight and si …

This depends on how deep engineering principles do you wish to teach. For simpler, shallower things, like the inherent stability of a triangle based construction versus a square based, the crawler cra …

One possibility is the Technic, Gear 8 Tooth without Friction. It was specificially designed to allow axles to slide through it. It can be held by 4 other 8-tooth gears, one of which could allow for t …

LEGO models of such structures can be found and analysed for their various building techniques to see which ideas would suit your expectations and situation. Rails: yes or no? …

Another solution, which, depending on your definition of "moderate torque", could be sufficient. Note the 1 stud long bush not being in click, in order to increase friction between the blue pin with …

How about trying Hinge Vehicle Roof Holder 1 x 4 with Hinge Train Gate 2 x 4? Their connection is a lot looser (at least for old parts) than the 1x2 finger plate hinges.

Having received a copy of 41755 Nova's Room as part of the 2024 Q1 Activity Support I could test my idea mentioned above - but it turns out the handle slot of the laptop piece is just a hair too small …

The "white connector sleeve linked to the other elements with smooth ended connection pieces" is certainly the intended way to build the model. The lack of rigid connection there acts as a torque-limi …

The step you mentioned (#309) shows two grey connectors (Plate, Modified 1 x 2 with Bar Handle on End) in exactly right configuration for this connection: It seems a clear case for these to be meant …

6 as the overall length is quite restrictive, but something like this could be adapted to work if sandwiched between other parts that restrict non-axial movements: where the black pieces are 1xX plat …

If I were to start this project, I'd consider using the spiral staircase pieces to build a curved staircase and see if it can work sufficiently with the rest of the mechanisms and scales. Another opt …

First of all, let's identify the parts you are trying to attach. The EV3 medium motor is a pretty accurate description, I'll assume it means this. The linear actuator is more ambiguous, it can mean …