Josef Prusa

Josef Prusa

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Founder, Prusa Research; open-source 3D printing, production scaling, materials, and factory operations.

Discover Hidden Printer Feature: Easy Mode & Firmware
SocialMay 11, 2026

Discover Hidden Printer Feature: Easy Mode & Firmware

I am always surprised how few people discovered this little gem in our printers 🤔 Here is the easy mode https://t.co/yQcVi1asP9 or you can dive deeper in the firmware repo https://t.co/NG7QsSjFlQ

By Josef Prusa
Our ±20 Μm Spec Is Worst Case, Not Reality
SocialMay 8, 2026

Our ±20 Μm Spec Is Worst Case, Not Reality

Pulled 5 years of @prusament QC data because "±20μm tolerance" is the spec everyone claims without blinking these days 😏 Turns out ±20μm is our worst case scenario, not our spec. 98.7% within ±10μm. 30.7% within ±1μm 😎 More stats...

By Josef Prusa
CORE One INDX Enables Ultra‑Efficient 8‑Tool 3D Printing
SocialApr 26, 2026

CORE One INDX Enables Ultra‑Efficient 8‑Tool 3D Printing

And people call us crazy for making super efficient 8 tool-changing 3D Printer 😇 This is everyday viable only on the CORE One INDX with it's 13 milligrams of waste per tool change. On everything else it is a wasteful...

By Josef Prusa
My Home Lab Runs Nonstop with 2×3090, 5090, M3 Ultra
SocialApr 20, 2026

My Home Lab Runs Nonstop with 2×3090, 5090, M3 Ultra

This is how my home lab feels 😂 2x3090, 5090 and M3Ultra crunching day and night 🫠

By Josef Prusa
Western Innovation Slowing as Price Race Overshadows True Cost
SocialMar 13, 2026

Western Innovation Slowing as Price Race Overshadows True Cost

Since it's Friday, I'd like to share some thoughts. Ideal for a weekend meditation or a (friendly) discussion. I just got back from my keynote in New York at Additive Manufacturing Strategies, and we need to talk about how we've taken...

By Josef Prusa