How to scale an object in animation? I want to create a scene for bridging in 3D-Printers. I scaled the abutments. But I couldn't find a way to scale bridge part. I know that my explanation is not that good. For you to better understand you can check the pics.

Thanks.



So my problem is,I don't know how to scale this part between 2 abutments.
Create a Bezier Curve and place it on top of your 2 cubes like in the picture





Select the top-left corner adn press E to extrude it and place the new vertex in the top-right corner (use X or Y to keep it at the same height). To get right corners set the Properties > Object Data > Shape > Resolution Preview U to 1.





Keep extruding until you get a rectangular spiral (I did it quickly so it's not straight, but you get the point)





Create a rectangle curve (it has to be a curve, not a mesh!) by using a circle with resolution set to 1 or by using the addon Add Curve: Extra Objects (it's already inBlender, you just need to enable it in the User Preferences).
In the spiral's Properties > Object Data > Geometry > Bevel > Object insert your rectangle and enable Fill Caps





Resize your rectangle and animate the End slider


If you want your corners to be a bit rounded you can increase your Resolution Preview U, but you'll have to play quite a bit with your vetex handles