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Exhibit A 3713:

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The near side is smooth on the circumference, but the far side has a wavy pattern. In Lego directions, the photos usually show the "orientation" of the bushing, but if I put it on the incorrect way, will it affect the build?

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The answer is studs. Note that there are more pieces with the same ability.

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Orientation of the bushing does matter when you run a rotating axle through a technic plate. Have the round side of the bushing pointing towards the studs. Otherwise the axle might lock up.

Here's an example from set 852 where this technique is used to attach the helicopter's rotor and propeller to an axle.

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    I would also add that initially, when Technic was released there were no studless beams. This required for new system to adapt to existing building approach - building studs up. In the end it required new (Technic) plates and adapted bushes to interlock assembly vertically. Later parts (like connectors in the photo) just followed new system.
    – Alex
    Commented Sep 19, 2019 at 10:40
  • @Alex Good point! I've added an example...
    – Uli
    Commented Sep 19, 2019 at 10:47
  • Makes perfect sense, thanks.
    – Raystafarian
    Commented Sep 19, 2019 at 21:37
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The wavy side allows you to wedge the bush between 4 studs on a plate or brick.

In my experience, placing the bush differently orientated never affects the build.

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