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Introduction Tired of the same old clamshell pencil cases? The Mechanical Iris Pencil Box is a twist‑open container that brings mechanical flair to something as simple as holding pencils. Load it with your favorite writing tools, give the lid a turn, and the smooth iris mechanism reveals your gear like you’re opening a secret vault.

Details & Benefits This ready‑to‑print, non‑parametric iris box is purpose‑built for pencils and pens, with two fixed lengths:

• 175 mm – fits shorter pencils or slim markers
• 195 mm – holds standard pencils with ease 

You can also personalize the lid with any design — initials, patterns, logos, or artwork — for a unique touch.

Other advantages:

• No CAD work required — just pick your size, slice, and print
• A standout upgrade from standard pencil cups or boxes
• Demonstrates smooth mechanical motion in a compact, functional piece
• Great as a gift for students, artists, or anyone who enjoys clever design

Printing & Assembly

• Designed for FDM printers, with no supports required
• Recommended settings: 0.2 mm layer height, 20% infill, PLA or PETG
• Print all components, fit the iris leaves and lid base, secure with five M3 screws for a self‑locking, twist‑to‑open lid

Ready to upgrade your pencil storage? Download the files, print your size, and enjoy the smoothest twist‑lid you’ve ever had on a pencil box.

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customize?

If you like the design but want more flexibility — different diameters, heights, custom logos, and multiple use cases — check out the expanded Parametric Iris Box here

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Assembly

Assembly is straightforward with super easy steps

Step 1

Start off by aligning your leaves and inserting screws through the slider

They should all be aligned in the shut position

Step 2

Align the handle with the 5 screws holes. 

Then screw the 5 screws in. 

Now the iris mechanism should work

Step 3

Finally glue/press fit the iris mechanism into the box. (Warning: you will not be able to change it if you glue that’s why I recommend the press fit)