The µRepRap is intended to be a RepRap (a replicating 3D printer) capable of micron (1/1000th of a millimetre, or 1µm) and sub-micron fabrication, made alongside lone average and effortlessly accessible materials. This flat of accuracy was initially made imaginable by 3D printed microscope platforms designed by The OpenFlexure Project. Variations additional suitable for prototyping and fabrication have since been developed, but kudos to them. Expectations for the first μRepRap prototype were to display repeatable positioning to improved than 3µm on a activity area 10mm throughout and to create a investigation tip in lieu of a imprint caput that is suitable for industry in a uncomplicated residence workshop. This goal has efficiently been achieved.
0.5mm "Benchy" 3D test example printed alongside μRepRap, 4μm tier height
"PIKA" V0.02 hardware is producing repeatable positioning of about 1μm and dependable 10μm or improved accuracy in an about 8mm cubic volume. Using a fine investigation etched alongside the PIKA scheme itself, UV resin droplets as small as 4μm have been deposited. With a fiber optic investigation 9μm resin lines have been cured. This is the current recommended build.
PIKA V0.02 Complete Circa May 2026
This was devised as a testbed for flexure components, and is lone mentioned since it has been thoroughly documented alongside a invoice of materials etc. It was updated to V0.05 to provision compatibility alongside PIKA Axis Drivers, but the complete records is for the "MAUS C" V0.04 (essentially a debugged V0.03). This achieved about 5μm positioning finest case complete a 4mm square, although motion is not linear. Maus-C-Build-Process instructions have been created. If you desire to download the pre-built STL records go current to Printables and day-to-day advancement is detailed on the RepRap blog.
MAUS 'L' V0.05 μRepRap, in betterment Feb 2026
Microelectronics and Micro-electromechanical Systems (MEMS) are essential components of most of the digital wizardry we use in our mundane lives, whether we realise it or not. In the way that RepRap brought Open 3D fabrication to the masses, the aim of the µRepRap Project is to bring users the identical capabilities on a much smaller measure and authorize those components to develop in the identical way. The resolution is efficiently a extremely exact and compact CNC machine.
The goal has two connected parts: To create a macro measure 3D printed micron fabrication and manipulation system, and during doing this create the techniques needed to reproduce a akin scheme printed at the micron scale.
A 1.3mm "Hello World" mechanically etched in Sharpie Marker on pane glide mid-2025
Precision manufacturing began location in the 1700's, and the archetypal micron measure digital devices were fabricated from silicon in the 1960’s. The Intel 4004, for example, was made alongside a characteristic size of 10μm. Ever since afterward the innovation focused mostly on silicon, alongside fabrication systems becoming always additional complex, esoteric, and costly. The techniques used are difficult for the average hobbyist to manage, and in many cases are downright dangerous.
In existence discipline and medicine, equipment to measure and manipulate objects on the micron measure are comparatively average - although these devices lean to be large, specialized, and expensive. Recently though, microscope platforms capable of sub-micron resolution were developed by The OpenFlexure Project, and these have created an engaging chance for evolving micron measure fabrication.
If micron measure manufacturing can be achieved by RepRap-like technology, it is apt that these sectors volition be advanced in the identical way that desktop fabrication was by the RepRap. The biologic sciences volition acquire from inexpensive, rapidly-evolving equipment. The microelectronics site volition regain the possible for autonomous communities create on the micron scale, and interrupt distant from its fixation on silicon as its chief platform. As alongside 3D printing, there volition certainly be new developments in sectors that do not currently equal exist.
There is additionally the possible (and intent) that this innovation could replicate in the forthcoming at a yet smaller scale.
Micron measure 3D printing has many of the identical requirements that The RepRap Project developed whenever initially printing on the macro scale:
- A 3-axis positioning system
- CAD/CAM software
- Axis zeroing sensors
- A deposition system
- Building material
In supplement there is the applicable aspect that humans are unable to immediately manipulate micron measure assemblies and sub-assemblies. Novel systems are hence needed to:
- Detach printed items
- Transport items
- Rotate and stance items
- Conduct micron measure care tasks
- Operate and interface alongside items
Similar issues volition be if and whenever a micron measure scheme is developed.
While accepted optics are readily accessible to authorize humans to initiate and inspect the fabrication processes, it is apt that several customisation of the optics volition be desirable.
For the instant two USB microscopes are sufficient. One to detect the first Z investigation height during setup, and one for the XY positioning of the investigation whenever commencing a print. A minimum of 8Mpixel resolution is recommended. Additionally a accepted place microscope of 100x to 200x volition be needed to analyze the output.
"Hello, World" and a 100μm quadrate set in resin using UV and a 125/9 optical fibre
Additionally, an optical fiber may be attached as the probe. This can be used to cure UV resin by projecting a sufficiently mighty UV origin downward the probe. This section describes how a 125/9 optical fiber place guide and 3W UV LED component can be attached to the μRepRap as a imprint head.
The axes are driven by 400-step NEMA17 stepper motors, but 200-step motors volition get fairly near to 1μm. The driving hardware and firmware is remaining to person preference, although existing developments assume interactive authority using GCODE on a serial connection. Arduino GRBL is adequate.
The investigation is used as a Z contact sensor, engraving tool, and deposition head. A sturdy investigation for first evaluation can be made from a 0.5mm hypodermic needle or 0.25mm accupuncture needle. These are sufficiently sturdy to use subtractively on resist-covered surfaces specified as Sharpie marker on a pane slide.
For fine deposition an electrochemically etched cable item is recommended. Instructions for fabrication alongside minimal equipment are in the Probe documentation. The PIKA is capable of etching its own probes.
Additive fabrication is currently implemented by transferring infinitesimal quantities of "Top Coat" UV nail gel resin alongside the probe. The lake is a smeared tier of resin. The investigation accepts this resin by capillary action. When depositing, capillary act forms comparatively accordant droplets. The figure of consecutively deposited droplets and their consistency depend on the qualities of the resin and probe, but sub-15μm droplets are achievable.
Other resins and ionic gels may additionally be used. A UV LED in the imprint bed operated by the hardware controller sets the resin.
Note: Thin layers of 3D printer UV resin do not readily set in air as oxygen neutralises the activated photoinitiator.
Other substances may be transferred. They key limitation is that their solvent should not evaporate during deposition.
Materials that readily adhere to the resin (which may be partially cured first) specified as aureate leaf may be added.
The current μRepRap 3D printer is intended to provision a phase for additional hardware and application betterment on the micron scale.
Much activity remains to be done in determining what can be printed and in what materials. If objects cannot be printed elevated enough, or alongside overhangs, folded structures, hinges, and flexures volition need to be developed to create complex 3D shapes and mechanisms.
It is hoped that μRepRap may be used to eventually build helpful devices in its own right, and an ecosystem of fabrication utilities that run on a yet smaller scale.
