unfavourablefavourable

• avoid sudden changes in cross-sectional area

          unfavourablefavourable

• minimise notch-like structures

          unfavourablefavourable

• provide large contact areas

          unfavourablefavourable

• Avoid corners and sharp edges, round
  inner edges and
  cutouts
  

          unfavourablefavourable

• avoid long, sharp edges
  (risk of breakage)
  

              favourable

• do not locate holes too close together