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For me it has to be any duplicated 1x1 pieces (especially where a 1x2 would suffice with no appreciable aesthetic difference) that are placed together yet meant to line up to form a straight wall, or column, or whatever. Aaagh, all for the bloody piece count! Give me a 1x2 instead. Biggest culprit is usually a row of cheese wedges.
Lining up headlight bricks falls under this category slightly, their freedom to spin a teensy tiny fraction off line even when up against other bricks. I don't seem to recall the issue as much with sets from the 1980's, but modern sets just seem to have that bit more freedom to swivel.
Oh, and flat 1x1's sometimes seem to refuse to sit square - like there's an almost imperceptible 'lip' on their edges, pushing against the edges of the brick beneath so they won't line up perfectly. Nudge to left... ugh, too far. Nudge to right... Ugh too far... small nudge left... ugh didn't move. Gentle nudge... overdone it... !
I think I'm most annoyed by "bricks that should actually be another brick", as in @legomatt's example with the use of two 1x1s where a 1x2 would look better and be structurally stronger. I'm always bemused by that sort of thing, especially in toys that you assume kids are going to play with and which could do with being as strong as possible...
Well my opinion is that it is the most annoying piece, regardless of what set or line it is part of.
Back on topic, a click hinge canopy that wouldn't correctly. My 8037 Anakin Y-Wing has canopy that won't close right because of the click hinges. Personally I'm not a fan of the click hinge. It's a one trick pony that gets used in inappropriate ways.
every dam time i tryed to link them it would push out the wall on the house or the wall on the Garage, Or both at the same time.
in the end, i dont quite know how i got it to link up, but i know this,
Next time i building that model. i am building them already Connected,
We have a winner! **close thread**
Oh, I know: it has many uses, and where would we be without it for lightsabers, etc. etc. But it's an absolute nightmare to separate from other parts. God knows why it's so different from its rounded, anti-studded ancestor; they're both made of ABS... maybe the lack of anti-stud makes it harder to get a grip on it when removing other parts? I'll admit to having fairly weak hands...
BrickOwl groups parts in both transparent and solid colours together, and then gives alternate part numbers. It then describes what that "one" part is made from. You can't do that.
Transparent parts can't be made from ABS. Many parts have two numbers for that reason - one for the solid part and one for the transparent (polycarbonate) one. So a 1 x 1 round brick has a design ID of 3062; a transparent one is 30068. BrickOwl Lumps them all together and says they're ABS. It's obviously wrong because the transparent ones can't be.
However, parts in solid colours don't have to be ABS; they can also be polycarbonate. The light sabre is one of those. You can tell because parts in both solid colours and transparent ones share the same design ID - transparent light sabres must be polycarbonate, so the solid colours must be too. You have to look parts up here on Brickset, because it (almost always) uses the official numbering which makes the distinction.
At least, that's how it used to be. The same principles still apply, but life has got a bit more complicated. Many parts now have newer numbers - five digit numbers beginning with 1 or 2. As I say, it doesn't change how it all works, except it means that there are extra numbers to consider. When trying to work out whether something is ABS or polycarbonate, ignore those newer numbers and see whether parts in both solid and transparent colours share design IDs. It's worth noting that parts can have different IDs for other reasons - typically because of detail design differences - but if they're the same, they're made of the same thing.
So, what is your least favourite piece? That one where you quietly grumble as you're using it.
For me, in Technics, it's the Beam 1x2 Thin - as they're just such a PITA to add and remove.
For regular sets, it's the Mechanical Arm (and similar) - just find they used to build fiddly, fragile 'sections' that never quite look like they're done right!
It is not that LEGO cannot make clear parts from ABS, they currently chose not to.
So yes, you can get clear ABS. However, ABS isn't a single material and TLG use a particular (and proprietary) formulation for its properties. They use polycarbonate for transparent parts because they can't get truly clear ABS with the properties required.
These need a lip like a tile or a cheese wedge the little *insert expletive*.