SLA Printing May Be The Future
Early desktop printers were horrible. For the price of thousands of dollars one got lo-res dot matrix printouts on paper that had tractor-feed holes punched into the margins. It wasn’t pretty, but those early models paved the way for high-resolution, low-cost laser printing.
Today’s hobby grade 3-D printers are similarly crude. They all use Fused Filament Fabrication (FFF) technology and are essentially robotic hot glue guns. Fortunately, a new generation of higher-resolution, faster, and more reliable machines are starting to come to market.
This new type of hobbyist printer use Stereolithography (SLA) technology, utilizing light instead of heat to make models. How? A high powered light source hardens a cross section of light-sensitive liquid plastic. The machine then raises the build platform a smidge and the process is repeated. It’s very dramatic — models look like they are being pulled from a puddle of goo.
This pioneering technology brings three much needed improvements to home based 3-D printers:
1. Higher Resolution Models, Built Quicker Parts made on SLA systems are much higher resolution than prints from FFF machines which have bumpy, ridged surfaces. They aren’t quite as polished as injection molded parts, but are almost as good as professional grade mills. Also, since the light hardens the plastic simultaneously, the only factor impacting print speed is the height of the object. With FFF printers, speed is determined by the amount of plastic needed to fill in a cross section, which can slow the process considerably.
2. More Complex Geometry is Possible. Trying to print complex shapes with severe undercuts or delicate features on a FFF machine would lead to nothing but pulled hair and wasted plastic. SLA opens up new, richer design possibilities.
3. Translucent Materials Because of its capacity for high-resolution and the nature of the chemicals used in the process, SLA models can be translucent. They won’t be optically clear, so you won’t be printing yourself new specs any time soon, but the see-through look brings a new palette of options for designers.
Yes, There Are Downsides SLA-based 3-D printers do have drawbacks. The biggest red flag is that no established companies are selling these kits yet. They’re being developed by enthusiasts (read: no dedicated customer service when you’re in desperate need of help).
Also, they’re expensive, retailing for $1,999 to $3,375. While that’s not too far a stretch from the top-of-the-line MakerBot, it’s vastly more than a $500 BuildrBot. The ‘consumable’ resin is also more expensive. A few pounds of plastic for an FFF machine costs $50-80, but a similar amount of light-sensitive resin will cost $120+ dollars.
Early-adopter limitations aside, SLA based 3-D printers are much closer to the state-of-the-art in the professional market and will produce parts that have the polished look of mass manufacturing. Ready to learn more? Than look up SLA 3D printers and see what’s on the cutting edge.