Some machines use just a UV laser and gimbals instead of the UV LED and the LCD mask, but those machines are usually a bit more expensive and not the type you’d start out on. So now, when you have that stackup and turn on the LED, you get a layer of cured resin on the very bottom of the VAT wherever that LCD screen is letting light through and you get no cured resin in the spots where the screen is masking off that UV light. So the way a resin printer works is that you start out with the liquid, gooey resin, that goes into the vat, which has a transparent bottom, and that goes over an LCD screen that, instead of lighting up with visible light like a TV or a computer screen, instead has a strong UV LED shining through it. And because the layers fuse together so well, resin prints can actually be incredibly strong and tough, but that depends on the exact resin you use. Also, because the layers of the resin prints are much finer and “melt together” more, you get a surface finish that looks more like an injection-moulded plastic part than a 3D print. A resin printer, on the other hand, can work over an order of magnitude more finely, at just 0.05 millimeters for the smallest detail it can produce under optimal conditions.
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The smallest features a normal filament printer can produce are at least about half a millimeter large, if you want them to look good, it’s more like a full millimeter.
When you look at the prints that filament and resin printers produce, it’s pretty obvious that they are very different beasts.Ī resin printer is capable of producing super-smooth surfaces and fine details that a filament printer wouldn’t be able to resolve with its comparatively massive nozzle and large layer heights. Last video we covered filament printers and what you should be looking for in one of those, today we’re going to go over when you would want to go for a resin printer instead and what to consider when getting one. If you want a 3D printer, the two fundamentally different options, at least if you want to spend less than a few grand, are filament printers, aka FDM or FFF, and resin printers, aka SLA or MSLA.
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