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Here it is: Lego
Other "illegal" connections were used by designers prior to this, so if your gauge of connections is what Lego has ever used, then you have many more options. I don't know of any resource that shows every building technique Lego has ever used though, so you might have to do thorough research to find them.
Lego Star Wars UCS X-Wing 7191 RARE Store Display
I find that there is a very slight left/right variation in this piece, thus when stacking them, I always take care to make sure the stud with the injection mark on it is always lined up over the same stud on the brick underneath, etc. this results in a more uniform appearance.
"Do what thou wilt shall be the whole of the law"
I've been a long time fan of Brickset and this is my first post. I hope this helps others as much as I hope it helps me.
I guess the usual protocol for first posts is an introduction. I am a Mechanical Engineer who has worked on the Mars Science Laboratory Curiosity rover along with a few other spacecraft. I'm also the guy who built this: http://lego.cuusoo.com/ideas/view/3431 , which you will soon see relates to my question.
Any project on CUUSOO, in order to be released, will have to adhere to the techniques that are considered legal by the LEGO Group. The best resource I have found so far has been the presentation called "Stressing the Elements" by Jaime Berard. Here are a few links to this useful guide: http://bramlambrecht.com/tmp/jamieberard-brickstress-bf06.pdf and http://cache.lego.com/downloads/brickfest2006/brickstress.ppt. The guide, however, is a little old and I think it would be great if this thread became a place to learn more about what LEGO considers legal or not.
I have recently been working on updating my CUUSOO model to keep within accepted LEGO building guidelines. Right now, my model uses the technique of assembling a Technic pin into a round 1X1 brick, which according to Jaime's guide, is not legal due to possible residual stresses. If you look closely, you can see this technique used in the "neck" that supports the head of my rover model.
I have worked on several alternative solutions and the best one involves using the newish 1x1 round plate with the hollow stud that is found in the games theme: http://www.bricklink.com/catalogItem.asp?P=85861. So, finally, here's my question. Is it really okay to have have bars go through these hollow studs? So far, I have not seen LEGO actually do this. They've mostly just used them as eyes for creatures in the games. Are they worried about these parts breaking if bars are put through them? I also wouldn't mind knowing why these parts have so far not appeared in any sets outside the games theme. It seems too useful to be so restricted.
Ultimately, I have no problem with "illegal" techniques used in many of the great MOCs out there. I'll bend the rules myself from time to time. I do find it interesting and useful to know what LEGO considers legal or not and would love to hear from others about any other current rules that LEGO adheres to.
In short, I don't know the answer! But I wouldn't be too concerned about remaining 'legal', as far as I am aware this is not a consideration when they approve CUSSOO models. LEGO will assess the model and redesign it wherever they think necessary. I've read Jamie's doc yet still see some rules broken in official LEGO models.
The Q about 1x1 dots with holes was raised at AFOLCON; designer Mark Stafford answered that it was something to do with Legal who weren't happy about not being able to have the 'LEGO' mark on a stud. He explained it as best he could and I don't remember exactly what he said, but it was clear he thought it was ridiculous, as did we!
@perijove looking on bricklink, it does seem the hollow stud plate is only in game sets so far. However I have the Minotaurus game and can confirm that the minotaur is constructed by putting a bar through the open stud, so it must classify as a legal connection. If a somewhat fiddly one to remove.
I was thinking that maybe LEGO was avoiding putting bars through the hollow stud in the new 1x1 round plate because there wasn't enough material around the edge to keep the piece from splitting if too much force was accidentally applied. I'm sure many of you have seen this happen with things like Technic bushings. Bricks with hollow studs wouldn’t have this problem and clips have open ends that allow for some flexing.
It's a great piece and I hope it eventually comes out in other themes with other colors. It's not the only LEGO piece that does not have the LEGO logo on it, an issue caperberry describes above (I’m pretty sure the 1x1 round bricks and cones are pieces with studs and yet no logo). Hopefully that doesn’t ultimately prevent the part from seeing more use.
Lego has been known to do similar bar through hole connections, the only exception where this would not be allowed was if both pieces were trans/clear colored elements, as the increased friction of that plastic type would make the bar stuck.
The Jamie Berard reference is really your best reference, and I'm fairly sure those rules are still what the designers use.
That 0.12 mm difference between the System Techine elements is interesting. There's a couple times I've used this illegal build. Sometimes there's been no problem, others there's a minor issue. Knowing there's a 0.12 mm difference I may go back and see if I can make my build legal (and more stable).