Ambiguous Cylinder Pen Holder Triangle and Circle 3D printable model by Alex and Tonic 3D
Ambiguous Cylinder Pen Holder Triangle and Circle photo 1 Ambiguous Cylinder Pen Holder Triangle and Circle photo 2 Ambiguous Cylinder Pen Holder Triangle and Circle photo 3 Ambiguous Cylinder Pen Holder Triangle and Circle photo 4

Ambiguous Cylinder Pen Holder Triangle and Circle

Source: MakerWorld by Alex and Tonic 3D

The Ambiguous Cylinder Pen Holder Triangle and Circle is a free printable 3D model from MakerWorld by Alex and Tonic 3D. I stumbled across the concept of Ambiguous Cylinders at the makeanything YT channel. You can download the STL file from the original listing below and print it at home.

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115 saves Source: MakerWorld Updated 2026-09-27 Print time: 3h 59m Filament: 110 g License: CC-BY-NC · non-commercial ★ 4.9 (10) 58 makes Category: Home & Organization

Tags: penholder, pencilholder, opticalillusion, ambiguouscylinder

About this model

I stumbled across the concept of Ambiguous Cylinders at the makeanything YT channel. These were shown by Kokichi Sugihara in Japan.I modelled a circle/triangle variant myself and arranged them to act as an intriguing pen holder for my work deskFor printing I suggest using a 0.6mm nozzle to save some time.If you want one and do not have a printer or the filament color you like, DM me.You can find this Pen Holder on my Etsy Shop

Frequently asked questions

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