This homebuilt 3D printer works at a scale you need a microscope to see

Vik Olliver’s RepRapMicron project is trying to bring home workshop fabrication down to the micron scale. The RepRapMicron project wiki reports that the PIKA version can cure resin lines nine microns wide using a fibre optic probe.

There’s a wonderfully improvised side to it. The project deposits tiny amounts of UV nail gel, and a basic probe can start with an acupuncture needle. Those are separate techniques, not a claim that a needle alone draws those nine-micron lines.

The wiki also shows a half-millimetre Benchy printed with four-micron layers. A boat that small really commits to the miniature part of miniature printing.

The PIKA section reports positioning of about one micron and reliable accuracy of ten microns or better within an approximately eight-millimetre cube. Positioning accuracy and the width of a cured line are different measurements, which matters when reading those tiny numbers.

This is a development platform, with work still needed on materials and what it can print. That’s what interests me: a project making precise fabrication more accessible while showing its working, rather than pretending the hard parts are finished.

I like being able to see the mechanism behind the claim. A small result with clear limits gives another maker somewhere useful to start.