I see it in MOCs all the time, and I’ve seen studs connect on half pins in official sets, but what about full pins?
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4Legal in what sense?– Peter MortensenJan 8, 2020 at 18:20
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3Here's a related question asking about the Technic pin to Travis brick connection used in at least one official set: bricks.stackexchange.com/questions/9702/…– jncraton ♦Jan 8, 2020 at 18:35
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7@PeterMortensen There are certain types of connections that Lego set designers are not allowed to make in sets. Either because it stresses the elements or because it becomes to difficult to take the elements appart for a child. These techniques are colloquially called "illegal" Some lego fans choose to adhere to the same rules in their own creations, some do not.– Michael VerschaeveJan 8, 2020 at 19:21
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2 Answers
The presentation that senior Lego designer Jamie Berard held at Brickcon 2006 and that spawned the entire legal vs illegal discussion can be found here:
https://www.hellobricks.com/pdf/jamieberard-brickstress-bf06.pdf
The particular case you ask for is discussed in slides 9 and 10:
answered Jan 8, 2020 at 8:32
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4There are less such documents than you might think. Lego is rather secretive about there design processes. Jamie Berard has commented that he has come to regret disseminating this document and that internally they use an updated document that isn't available in the wild. Jan 8, 2020 at 15:15
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11Why the regret, and why wouldn't Lego want people to know what connections add unwanted stress on bricks? Jan 8, 2020 at 22:19
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7Perhaps "regret" was a too strong choice of words. He implied something like that jokingly during a presentation I saw. The document itself generated a lot of discussion over the years. People started to take it very seriously, meticulously going over any lego instructions to search for instances where Lego might have broken there own rules (there are many to be found). Also, many lego builders didn't took too kindly to techniques in their creations being called "illegal". Jan 9, 2020 at 9:28
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4I believe the lego group is hesitant to put out any official document on this because: - the aforementioned discussion it prevokes. - they being tied down by their own "rules". - as new connections are being invented all the time it is very hard to have a comprehensive document listing all things illegal/legal - possibility of leaking trade secrets which clone brands will take advantage off.. Jan 9, 2020 at 9:56
According to LEGO, this type of connection is illegal, since the pin is stressed when connected to an anti-stud and eventually deforms.
People's MOCs do not follow same policy as TLG does. So you may encounter illegal connections from time to time. Pins are also cheap and usually owned in high numbers, so nobody's really bothered if one gets deformed.
