Is this 3D model free to download?

Yes, Ninja Lock - Indoor Child Door Lock is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link to open the original listing by the creator.

Where do I download the STL file?

The download is hosted by Thingiverse. Use the "Download from Thingiverse" link on this page to open the original listing and grab the file, or save it to your print queue in the free Thinger app.

Designed by bslayton, published on Thingiverse. Please credit the creator when sharing your print.

Can I print this at home?

Yes. This is a printable 3D model intended for home FDM and resin printers. Check the original listing for suggested print settings.

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

Ninja Lock - Indoor Child Door Lock photo 1

Ninja Lock - Indoor Child Door Lock photo 2

Ninja Lock - Indoor Child Door Lock photo 3

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.

Open in Thinger (free) Download from Thingiverse

4,236 saves Source: Thingiverse Updated 2026-10-24 License: CC-BY-NC-SA · non-commercial 29 makes Category: Home & Organization

Tags: ajar, childproof, Children, child proof, child proofing, child safety, Door latch, ninja safety

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. Open it in the free Thinger app, or use the "Download from Thingiverse" link 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.