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The µRepRap is meant to be a RepRap (a replicating 3D printer) able to micron (1/a thousandth of a millimetre, or 1µm) and sub-micron fabrication, made with solely widespread and simply accessible supplies. This diploma of accuracy was initially made doable by 3D printed microscope platforms designed by The OpenFlexure Project. Variations extra appropriate for prototyping and fabrication have since been developed, however kudos to them. Expectations for the preliminary μRepRap prototype had been to exhibit repeatable positioning to higher than 3µm on a piece space 10mm throughout and to supply a probe tip in lieu of a print head that’s appropriate for manufacture in a easy dwelling workshop. This objective has successfully been achieved.

0.5mm “Benchy” 3D check mannequin printed with μRepRap, 4μm layer peak

“PIKA” V0.02 hardware is producing repeatable positioning of roughly 1μm and dependable 10μm or higher accuracy in an roughly 8mm cubic quantity. Using a effective probe etched with the PIKA mechanism itself, UV resin droplets as small as 4μm have been deposited. With a fibre optic probe 9μm resin strains have been cured. This is the present beneficial construct.

PIKA V0.02 Complete Circa May 2026

This was devised as a testbed for flexure elements, and is barely talked about as a result of it has been totally documented with a invoice of supplies and so forth. It was up to date to V0.05 to provide compatibility with PIKA Axis Drivers, however the full documentation is for the “MAUS C” V0.04 (primarily a debugged V0.03). This achieved roughly 5μm positioning finest case over a 4mm sq., although movement will not be linear. Maus-C-Build-Process directions have been created. If you need to obtain the pre-built STL recordsdata go here to Printables and day-to-day progress is detailed on the RepRap blog.

MAUS ‘L’ V0.05 μRepRap, in growth Feb 2026

Microelectronics and Micro-electromechanical Systems (MEMS) are important elements of a lot of the digital wizardry we use in our on a regular basis lives, whether or not we realise it or not. In the way in which that RepRap introduced Open 3D fabrication to the lots, the purpose of the µRepRap Project is to convey customers the identical capabilities on a a lot smaller scale and permit these elements to evolve in the identical manner. The resolution is successfully a really exact and compact CNC machine.

The goal has two associated components: To create a macro scale 3D printed micron fabrication and manipulation system, and whereas doing this develop the methods wanted to breed the same system printed on the micron scale.

A 1.3mm “Hello World” mechanically etched in Sharpie Marker on glass slide mid-2025

Precision manufacturing started someplace within the 1700’s, and the primary micron scale digital gadgets had been fabricated from silicon within the 1960’s. The Intel 4004, for instance, was made with a characteristic dimension of 10μm. Ever since then the expertise targeted largely on silicon, with fabrication programs turning into ever extra advanced, esoteric, and expensive. The methods used are tough for the typical hobbyist to handle, and in lots of instances are downright harmful.

In biology and medication, gear to measure and manipulate objects on the micron scale are comparatively widespread – although these gadgets are usually giant, specialised, and costly. Recently although, microscope platforms able to sub-micron decision had been developed by The OpenFlexure Project, and these have created an fascinating alternative for creating micron scale fabrication.

If micron scale manufacturing will be achieved by RepRap-like expertise, it’s probably that these fields will likely be superior in the identical manner that desktop fabrication was by the RepRap. The organic sciences will acquire from cheap, rapidly-evolving gear. The microelectronics subject will regain the potential for unbiased communities develop on the micron scale, and break free from its fixation on silicon as its principal platform. As with 3D printing, there will definitely be new developments in fields that don’t at the moment even exist.

There can be the likelihood (and intent) that this expertise may replicate sooner or later at a but smaller scale.

Micron scale 3D printing has most of the similar necessities that The RepRap Project developed when initially printing on the macro scale:

• A 3-axis positioning system
• CAD/CAM software program
• Axis zeroing sensors
• A deposition system
• Building materials

In addition there may be the sensible facet that people are unable to straight manipulate micron scale assemblies and sub-assemblies. Novel programs are subsequently wanted to:

• Detach printed objects
• Transport objects
• Rotate and place objects
• Conduct micron scale upkeep duties
• Operate and interface with objects

Similar points will exist if and when a micron scale system is developed.

While standard optics are available to permit people to provoke and examine the fabrication processes, it’s probably that some customisation of the optics will likely be fascinating.

For the second two USB microscopes are ample. One to watch the preliminary Z probe peak throughout setup, and one for the XY positioning of the probe when commencing a print. A minimal of 8Mpixel decision is beneficial. Additionally a standard bench microscope of 100x to 200x will likely be wanted to look at the output.

“Hello, World” and a 100μm sq. set in resin utilizing UV and a 125/9 optical fibre

Additionally, an optical fibre could also be hooked up because the probe. This can be utilized to treatment UV resin by projecting a sufficiently highly effective UV supply down the probe. This section describes how a 125/9 optical fibre patch lead and 3W UV LED module will be hooked up to the μRepRap as a print head.

The axes are pushed by 400-step NEMA17 stepper motors, however 200-step motors will get fairly near 1μm. The driving {hardware} and firmware is left to consumer choice, although current developments assume interactive management utilizing GCODE on a serial connection. Arduino GRBL is enough.

The probe is used as a Z contact sensor, engraving instrument, and deposition head. A sturdy probe for preliminary testing will be constituted of a 0.5mm hypodermic needle or 0.25mm accupuncture needle. These are sufficiently strong to make use of subtractively on resist-covered surfaces corresponding to Sharpie marker on a glass slide.

For effective deposition an electrochemically etched wire level is beneficial. Instructions for fabrication with minimal gear are within the Probe documentation. The PIKA is able to etching its personal probes.

Additive fabrication is at the moment applied by transferring minute portions of “Top Coat” UV nail gel resin with the probe. The reservoir is a smeared layer of resin. The probe accepts this resin by capillary motion. When depositing, capillary motion varieties comparatively constant droplets. The variety of consecutively deposited droplets and their consistency rely upon the qualities of the resin and probe, however sub-15μm droplets are achievable.

Other resins and ionic gels might also be used. A UV LED within the print mattress operated by the {hardware} controller units the resin.

Note: Thin layers of 3D printer UV resin don’t readily set in air as oxygen neutralises the activated photoinitiator.

Other substances could also be transferred. They key limitation is that their solvent mustn’t evaporate throughout deposition.

Materials that readily adhere to the resin (which can be partially cured first) corresponding to gold leaf could also be added.

The present μRepRap 3D printer is meant to offer a platform for additional {hardware} and software program growth on the micron scale.

Much work stays to be completed in figuring out what will be printed and in what supplies. If objects can’t be printed excessive sufficient, or with overhangs, folded buildings, hinges, and flexures will should be developed to supply advanced 3D shapes and mechanisms.

It is hoped that μRepRap could also be used to ultimately assemble helpful gadgets in its personal proper, and an ecosystem of fabrication utilities that function on a but smaller scale.