3D printing is often associated with popular FDM printers, which layer molten filament one after another. But that's just one method. If we care about ultra-precise prints, such as in jewelry, dentistry, or creating collectible figurines, the technology mSLA (masked Stereolithography Apparatus).

Where did mSLA come from?

The history of mSLA is an evolution of SLA (Stereolithography) technology – one of the first 3D printing methods developed back in the 80s. Classic SLA used a laser to cure resin point by point. It was very precise but relatively slow.

Then DLP (Digital Light Processing) appeared, which uses a projector instead of a laser – the entire layer is cured simultaneously. mSLA takes it a step further – instead of a projector, it uses an LCD screen with UV backlighting, which acts as a "mask" and blocks light where the resin should not be cured. This makes the process fast, and the devices are cheaper and more compact.

How does an mSLA printer work?

The printing process can be described in a few steps:

• Resin – instead of filament, we use liquid photopolymer resin.
• Light source – UV LEDs illuminate the LCD screen.
• Mask (screen) – the LCD screen displays the "negative" of the layer of the model and lets light through only where the resin is to be cured.
• Building the model – the work platform slowly rises, and the successive layers are cured.

The result? A finished print with incredible accuracy – often below 50 micrometers, with perfectly smooth surfaces and sharp details.

Why mSLA?

• High precision – excellent reproduction of fine details.
• Speed – the entire layer is cured simultaneously.
• Cost – mSLA printers are cheaper than classic SLA or DLP.
• Professional applications – dentistry, jewelry, engineering models, figurines, and prototypes requiring high accuracy.

What should be remembered?

Printing in mSLA technology requires some discipline:

• Resins are sensitive to light and require proper storage.
• After printing, the elements must be washed in isopropyl alcohol and additionally cured under UV light.
• Materials can be brittle, although more and more engineering and biocompatible resins are appearing on the market.

Summary

mSLA is a technology that has opened the door to the world of very precise 3D printing at an affordable price. Thanks to it, prints that were once only available in laboratories or expensive design offices can now be created even on a desk in a workshop.

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