What it says in the title. Can you even insert bars into these anymore? Was this done for sturdiness or to prevent breakage? I'm just curious

Softer material is being used for the past few years which means parts have to be redesigned. I'm not sure, but I think they switched from ABS to MABS which can be moulded in transparent colors without needing a seperate mould. 

Edited October 7, 2024Oct 7 by Zerobricks

43 minutes ago, Zerobricks said:

Softer material is being used for the past few years which means parts have to be redesigned. I'm not sure, but I think they switched from ABS to MABS which can be moulded in transparent colors without needing a seperate mould. 

Oh thats why if i build linkage mechanism with newly produced lego parts that those beams leave dust to black pins especially light bluish grey beams are prone to leaving dust on black pin

Some parts like the 3L friction pins have always had square holes.  I guess probably it's to make them sturdier.  I don't know if the parts in question started out with bar holes though, older 2780 2L friction pins have a round hole that's too small for bars.  So maybe they're just moving from almost-fits to definite non-fits.

1 hour ago, Auroralampinen said:

Oh thats why if i build linkage mechanism with newly produced lego parts that those beams leave dust to black pins especially light bluish grey beams are prone to leaving dust on black pin

Black pins have friction, and are not meant to rotate much. So of course if you built a mechanism using them, you would get plastic dust! Try using light gray pins instead - these are frictionless.

39 minutes ago, Murdoch17 said:

Black pins have friction, and are not meant to rotate much. So of course if you built a mechanism using them, you would get plastic dust! Try using light gray pins instead - these are frictionless.

Well my old pins and beams did not do this

14 minutes ago, Auroralampinen said:

Well my old pins and beams did not do this

It's been like this since the beginning of Technic: 1982 / '84 for black friction pins (old / new), and 1977 for light gray frictionless. The pins have always been color-coded this way.

Just letting you know.

3 hours ago, Murdoch17 said:

Try using light gray pins instead - these are frictionless.

It's all about the play in the finished model. 42054 used Bue axle pins to get away from that slack in each wheel.

2 hours ago, M_longer said:

It's all about the play in the finished model. 42054 used Bue axle pins to get away from that slack in each wheel.

Yes i used black pins on hoods and hood linkages so the hood stays on place when opened and this simple thing can do a lot of wear on those recently maded beams because there is dust in black pins already about 30min of using old pins and beams never did do this and also in lego trucks the cab opening linkage mechanism always used black pins

Edited October 7, 2024Oct 7 by Auroralampinen

Pins with square holes are a  sin, and lego needs to stop it

I wish I had a better colour of 15100 for photograph reasons, but it turns out the 42107 Ducati Panigale is the only set I had handy that uses them, in black.  The white one is from the 42167 Garbage Truck (current year)

Neither of them will accept a bar, but 65487 is described as "square holes" and 15100 is not.  It's definitely a smaller hole, despite which the 15100 is a significantly harder connection to make.  Different plastic I suppose.  Other than this I couldn't see any differences in part design, I did confirm the part #s are printed on the side of the pin in extremely tiny letters.