Ninja Lock - Indoor Child Door Lock 3D printable model by bslayton

Ninja Lock - Indoor Child Door Lock

Source: Thingiverse by bslayton

The Ninja Lock - Indoor Child Door Lock is a free printable 3D model from Thingiverse by bslayton. If you have kids, chances are they are ninja's just like mine. You can download the STL file from the original listing below and print it at home.

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243 saves Source: Thingiverse Updated 2026-04-18

Tags: Ninja, Lock, -, Indoor, Child, Door, Lock

About this model

If you have kids, chances are they are ninja's just like mine. These little ninja's will get into anything and everything (including taking a sharpie to your white kitchen cabinets). I designed this device that slips over the door (preferably near the top) and locks the door within the door frame so that we can stop our little ninjas in their tracks. It also has a built in mechanism to prevent smashed fingers. I've tested this with my 3 and 2 year old. It works great! Let me know what you guys/gals think in the comments and/or if you would like to see modifications. I plan to improve and come out with more ~~child~~ ninja safety in the future. *Update: Added the .f3d file from Autodesk Fusion 360. Update (10/23/15) - After a good solid month of use, I had one of these snap right in bend of…

Frequently asked questions

Is this 3D model free to download?
Yes. Ninja Lock - Indoor Child Door Lock is free to download from Thingiverse. Click the "Download free STL" button above to open the original listing.
Where is the STL hosted?
The download is hosted by Thingiverse, not by Thinger. We link you directly to the original listing by bslayton.
Who made this model?
Designed by bslayton, published on Thingiverse. Please credit the creator when sharing your print online.
Can I print this at home?
Yes. This model is intended for home FDM and resin 3D printers. Check the original listing for suggested print settings like layer height and supports.

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