#0020 Utility Knife / Box Cutter with Click-Close Feature (Left/Right Handed Versions)

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Inspired by an idea from @3DBrooklyn, I came up with this design that is easy to use and easy to print.  My family and I have been using it for almost 2 years now and just wanted to share this design with others.

It features:

1. Fits standard utility blades you can find at a hardware store.
2. Ergonomic fitment to either the right hand or left hand - take your pick.  Because I was looking for the most convenient positioning of the lever for the hand for use, I had to sacrifice creating a single version that fits both hands.  (Honestly those don't feel very comfortable to me).
3. 2-position blade protrusion.  A positive stop at each position holds the blade in place during use.
   • The first position extends only enough to cut through cardboard without going too deep to damage the stuff inside the box.
4. A Click-Close feature that you just easily slide the insert (sheath) to close the blade and it locks closed.
5. Separate the insert (sheath) and handle to change out the blade.

Notes:

Left handed version is marked with “LH” and right handed version marked with “RH”.

Instructions:

1. For the handle, use a 3-4mm brim to help with bed adhesion.  No support needed. Printing orientation matters.  Please follow the orientation shown in the pics. 
2. For the insert, some support is needed, please pay attention to print orientation.
3. PETG recommended, but you can try any filament.
4. Use Exacto knife to help break free the lever from the geometry it sits on, so it can start functioning as a lever.

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Happy printing!