Hi Jack, check the placement of the circle profile curve that is being swept. If it is inside the bounding box around the rails it will use the circle from its current position. If it is outside the bounding box around the rails it will use "auto place" mode where it will automatically move and rotate the circle onto the starting position of each rail. For this case you want auto place mode to be used.

If you're still having trouble please post the 3dm model file with the curves you are trying to use so I can see what you are running into.

- Michael

Hi Pilou,
Why don't you use the same process as Michael for your little demonstration videos (post 10215.8 below), I think it would be more explicit.

https://www.screencast.com/

-Zooen

thx, problem already solved

@ Zooen It's not the same price and for 10 - 20 seconds that is the same result! ;)
There are a lot fo screen recorders but i prefere my very simple GifCam
https://moiscript.weebly.com/gifcam.html (Manual VF or English)