Is this 3D model free to download?

Yes, Ambiguous Circle to Triangle Illusion is free to download from MyMiniFactory. Open it in the free Thinger app, or use the "Download from MyMiniFactory" link to open the original listing by the creator.

Where do I download the STL file?

The download is hosted by MyMiniFactory. Use the "Download from MyMiniFactory" 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 MakeAnything, published on MyMiniFactory. 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.

Ambiguous Circle to Triangle Illusion

Source: MyMiniFactory by MakeAnything

The Ambiguous Circle to Triangle Illusion is a free printable 3D model from MyMiniFactory by MakeAnything. This weird shape resembles two simple yet drastically different shapes in one! With a mirror, you can see both perspectives simultaneously. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from MyMiniFactory

30 saves Source: MyMiniFactory Updated 2026-10-23

Tags: optical, trick, magic, shapes, shape, tricks, illusion, POV, ambiguous, Illusions

About this model

This weird shape resembles two simple yet drastically different shapes in one! With a mirror, you can see both perspectives simultaneously. Truly mind-blowing! This is my variation of Dr. Kokichi Sugihara's Ambiguous Cylinder Illusion, featuring a circle and a triangle. I printed it with MatterHackers Quantum PLA to get two distinct colors. --- I had success printing at 0.12mm-0.16mm layer height. Smaller layer height should significantly improve the top surface. 2 shells, 0% infill, 6 top and bottom layers. --- There are also two versions of the base, and two lengths of printable rods for the base. You can also use any 1/8" rods.

Frequently asked questions

Is this 3D model free to download?: Yes. Ambiguous Circle to Triangle Illusion is free to download from MyMiniFactory. Open it in the free Thinger app, or use the "Download from MyMiniFactory" link above to open the original listing.
Where is the STL hosted?: The download is hosted by MyMiniFactory, not by Thinger. We link you directly to the original listing by MakeAnything.
Who made this model?: Designed by MakeAnything, published on MyMiniFactory. 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.