Is this 3D model free to download?

Yes, Train Set Coupler 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 bnelson333, 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.

Train Set Coupler Lock 3D printable model by bnelson333

Train Set Coupler Lock

Source: Thingiverse by bnelson333

The Train Set Coupler Lock is a free printable 3D model from Thingiverse by bnelson333. I really like the train set thing by KrispyKevin but it has one flaw: the hitches are too simple and come undone very easily, especially if going up the bridge hill. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Thingiverse

30 saves Source: Thingiverse Updated 2026-09-24 License: CC-BY · commercial OK Category: Toys & Games

Tags: Train, Set, Coupler, Lock

About this model

I really like the train set thing by KrispyKevin but it has one flaw: the hitches are too simple and come undone very easily, especially if going up the bridge hill. I set out to design some sort of clip to lock the cars together that would not require remixing/reprinting the actual cars themselves. This thing is a pressure fit coupler/lock that fits over the connected cars at the hitch point. It fits snug without being too snug, stays in place, and has ridges to assist in getting grip to remove. If you print standing up you shouldn't need supports. I have included 2 dimensions of the back block. I think generally, printing the "thinner" version is going to be a good fit for you. But if you find that it's too thin to make good contact, you could try printing the "thicker" version. It has a…

Frequently asked questions

Is this 3D model free to download?: Yes. Train Set Coupler 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 bnelson333.
Who made this model?: Designed by bnelson333, 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.

Similar 3D models in Train

Gear / Paid link The gear we print with Filament, tools, build plates and the hardware behind the models on Thinger, in one shoppable photo on our Amazon storefront. See the gear → Thinger earns a commission from qualifying purchases made through this link, at no extra cost to you.