MonoLock – One-Piece PLA Flexure Locking Forceps
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One-piece PLA locking forceps with a U-shaped flexure and a two-tooth latch. No screws or assembly required.
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MonoLock – One-Piece PLA Flexure Locking Forceps
MonoLock is a one-piece, 3D-printable mechanical clamp inspired by the form of hemostatic forceps. It was developed in OpenSCAD as part of an academic design and 3D-printing project.
The mechanism uses a U-shaped flexure to connect the arms and provide elastic movement. Two opposing toothed tabs allow the clamp to be locked and manually released.
The entire model is printed as a single piece, without screws, glue, hinges or assembly.
A physical prototype was printed in PLA, and its locking mechanism was successfully tested manually.
Recommended Print Settings
Material: PLA
Nozzle: 0.4 mm
Layer height: 0.20 mm
Wall line count: 4
Infill: 100%
Printing temperature: 205°C
Bed temperature: 60°C
Print speed: 40 mm/s
Supports: No
Bed adhesion: Skirt
Orientation: Flat on the build plate
These are recommended starting settings and may need adjustment depending on the printer and filament.
How to Use
Gently squeeze the finger rings to close the jaws.
Allow the opposing teeth to engage and lock the clamp.
To release, carefully disengage one of the locking tabs without applying excessive force.
Included Files
STL file, ready for slicing.
Important Safety Notice
This is an educational and experimental mechanical prototype, NOT a medical device.
It has not been validated for clinical use, sterilization, patient contact, clamping force or long-term durability. PLA may crack or fail under repeated bending or excessive force.