OTF Fidget Knife Over-Engineered and Upgradeable

OTF Pro Trapezoid & 18mm Utility Blade O-Eng'ed

OTF Over-Engineered Comb upgrade kit

OTF Switch Knife Improved

OTF Mini Fidget Box Opener Over-Engineered

OTF Knife Over-Engineered Metal Spring Upgrade Kit

Functioning Switchblade

OTF Fidget Comb (Fully 3D Printed)

OTF Candy Cane

Multiple Sizes OTF Fidget Knife (Hogue Deka Style)

Scalpel #24 for a Double Action OTF Knife by iczfirz

Tighter Fit Blades for OTF

Upright Folding Knife Display | Multiple Sizes

OTF Fidget Knife - Tactical Grip

Alternate blade for OTF letter opener

Heart-shaped blade inserts for an OTF fidget knife by iczfirz

OTF blade

Stronger pins on the spring for OTF Fidget Knife.