Is this 3D model free to download?

Yes, The Squarcle (A 3D Optical Illusion) 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 PhilKloppers, 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.

The Squarcle (A 3D Optical Illusion) 3D printable model by PhilKloppers

The Squarcle (A 3D Optical Illusion) photo 1

The Squarcle (A 3D Optical Illusion) photo 2

The Squarcle (A 3D Optical Illusion) photo 3

The Squarcle (A 3D Optical Illusion)

Source: Thingiverse by PhilKloppers

The The Squarcle (A 3D Optical Illusion) is a free printable 3D model from Thingiverse by PhilKloppers. The Squarcle is a 3D optical illusion based on the work of Kokichi Sugihara (as seen at I was so intrigued after watching that that I was compelled to try to replicate it myself!. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Thingiverse

1,052 saves Source: Thingiverse Updated 2026-11-06 License: CC-BY · commercial OK 11 makes Category: Education & Science

Tags: illusion, optical illusion, sugihara

About this model

The Squarcle is a 3D optical illusion based on the work of Kokichi Sugihara (as seen at I was so intrigued after watching that that I was compelled to try to replicate it myself! It has taken multiple attempts and several revisions, and I am now happy to present it here. I have included 2 STL's, one with a mirrored bottom that enhances the illusion but requires supports, and one with a flat bottom that is easier to print.

Frequently asked questions

Is this 3D model free to download?: Yes. The Squarcle (A 3D Optical Illusion) 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 PhilKloppers.
Who made this model?: Designed by PhilKloppers, 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.