Summary

Made a soft collar for my little Jack Russel - the last notch is a loose fit for her neck but won't simply fall off.
Last notch is 298mm, 3rd notch is 288mm, 2nd notch is 278mm and 1st notch is 268mm
Material is TPU and only 1mm thick so very flexible and soft.
Printed on a Bambu Labs A1

• added a Mk2 with a slightly longer flap past the post to prevent pull through
  Intended only as a walkies collar - it will not stay in place without a lead attached.