Credit Card-Sized Utility Knife - 9mm Blades

1. Blade Mechanism

- The blade extends/retracts via a sliding button with controlled resistance to prevent accidental deployment. - Audible "click" feedback is provided during sliding (multi-stage engagement confirmed). 2. Dimensions & Compatibility

- Exact credit card footprint (85.6×54mm) with 6mm thickness (slightly thicker than standard cards). - Blade Compatibility : - Designed for 9mm-wide utility blades (e.g., Stanley 11-300T-22: 9mm×85mm). - Modification Required : Snap off the first 3 segments (~15mm) to fit the compact frame. - Pro Tip : Ideal for repurposing used blades !

3. Material & Calibration

- Tested with PETG/PLA - both functional but may exhibit varying shrinkage (risk of over-tight assembly). - Included Backup Parts (in .3mf files): - Low-friction Slider : Reduces sliding force if primary part feels stiff. - Looser End Cap : Easier installation if original cap fits too tightly.

Printing Instructions:

Supports needed—peel-off easy! But DON'T skip the ones I added manually. They're there to save your print!

Assembly

All parts displayed

Insert blade & slider from rear → Critical: Press blade flush against top of knife casing!

Extend blade 3 notches beyond casing (~15mm)

Snap off blade segment → Use grooves on end cap or pliers for cleaner break

nstall end cap. Done!