Hi Tony,

re:
> I followed Pilou's video but I must have made a little mistake

Does Pilou's steps involve copying a length value and using it somewhere else?

If so then before you do that step try setting Options > Genreal > "Decimal display" to the maximum 7 decimal places (1.0000000) so that you'll have more precision in your result.

- Michael

My method gives 503,2224539
Original cone is 503,2206188
best of Psygorn is 503,221746 so he wins by 0,000007! :)

Ok Michael I will follow your advice ;)