Fully Customizable Cabinet Knob & Handle Lock

A fully parametric lock for cabinets with any knob or handle dimension! 

Introduction

I did not see a model like it so when my cats kept getting into their food cabinet, and I got tired of using a rubber band for the knobs, I finally made this. This will certainly keep out any curious critters or children. I do not have any handled cabinets to test this on but I believe you can adapt it to fit inside of a set of handles to keep them secured as well. I hope you find it helpful and can make it fit your usecase!

The included gcode and stl are for reference only - They were designed for my cabinet specifially so unless you want to mess with the scale percentages in your slicer, I HIGHLY suggest you download the .scad (OpenSCAD) file and follow the directions below. A set of digital calipers will make taking your measurements much easier.

TLDR: Measure things out, adjust the parameters in OpenSCAD, test print if you want, print, ???, profit.

Print settings

Infill: 10-25% 3D Honeycomb; I did mine at 25% so that it would be fairly strong and not break if a pet or child tried to force it

Layer Height: 0.3mm; pick

Perimeters: 3

Solid layers Top & Bottom: 4

Material: PETG is ideal, but PLA or anything will likely suffice

How to customize your own! (Pictures included above)

1. Measurements
   1. holeDistance - The distance between the inside of your knobs/handles
   2. holeDiameter - The diameter/length of the knob/handle where the lock will be resting  
   3. partDepth - The depth of the back of the knob/handle to the wall. This will be the overall thickness of the part
   4. Others - Estimate the width and height that you want it to be. Be sure there is enough structure to keep it strong above the cutouts.
2. OpenSCAD - Open .scad file and enter the measurements that you took. On the right there is a “Customizer” pane where you can do so. Adjust the height and width to your liking. Next press F6 to render and then F7 to export your model to an .stl
3. PrusaSlicer (or whatever slicer you use) 
   1. I suggest you first print a 2 or 3 layer part by setting the “z size” to .5 mm or less to make sure the measurements you took were accurate and translated properly.
   2. Whether you choose to do a test print or not you are ready to print the real one. Use the suggested print setting above or use your own
4. Share and Comment if you like it!