Hi, its simple knife grip/guide i find useful in sponge cakes cutting.
I made several versions for different knives:

• 0.5 mm,
• 1 mm,
• 1.5 mm,
• 2 mm,
• 2.5 mm,
• 3 mm.
  Before printing, please measure your knife and choose right version, where knife is tight. Print double ;)
  Feel free to ask for different gaps or heights ;)