January 26, 2026
Nano drama, macro feels
OpenFlexure Microscope
DIY lab hero returns: fans cheer while skeptics yell “old news”
TLDR: An open-source, 3D‑printed microscope using a Raspberry Pi is trending again, promising low‑cost, lab‑like results. Fans celebrate accessible science, while skeptics call it dated and point to newer projects like PUMA — making it a lively showdown over the future of DIY lab gear.
The OpenFlexure Microscope — an open-source, 3D‑printed lab tool that runs on a Raspberry Pi — just had a comeback moment, and the crowd is split. Supporters swoon over “microscopy for everyone”, praising its swappable optics, bendy plastic springs (called flexures) for smooth motion, and cool add-ons like glow-in-the-dark fluorescence imaging. Hype peaked again on Hacker News, with a victory lap noting it was popular in 2021 and now again in 2024 (thread, old thread).
But the hot take brigade is loud. One critic shrugged, “Fun old project” and said tech’s moved on, dropping a slick video to prove it. Another commenter pointed to a rival DIY scope, PUMA (link), which sparked a mini turf war of “which home lab kit is king?” Meanwhile, casuals joked about turning kitchen counters into labs and argued whether “inverted optics” (looking from below) is genius or just clever marketing.
Under the memes, real substance: this design prints most of the moving bits as one piece, gets super tiny motion steps (less than a hair’s width by a long shot), and keeps samples steady for days. Price-wise, the Raspberry Pi and camera are the main cost, making it a budget-friendly path to science. Verdict from the crowd? Equal parts love letter and side-eye — and very entertaining.
Key Points
- •OpenFlexure Microscope is an open-source, customizable optical microscope with inverted geometry and a 3D-printed flexure stage.
- •The stage uses plastic flexures for frictionless, vibration-free motion, achieving sub-100 nm steps with miniature stepper motors and multi-day micron-level stability.
- •The design minimizes assembly and non-printed parts; most components, including flexures, are printed as a single piece.
- •Cost is kept low, with the Raspberry Pi and its camera module forming the bulk of expense; approximately 200 g of plastic and a few fasteners are required.
- •The optics module is swappable, supporting RMS objectives and optional printed filter cubes for epi-illumination, polarization-contrast, and fluorescence imaging.