There are lots of completely different 3D printing processes, however all of them have one factor in frequent: layers. They could not all have flat layers, however all of them work by increase materials layer-by-layer. That limits 3D printing to the pace at which the machine can type a layer. Besides I lied to you and it’s potential to print with out layers in any respect. And now that expertise is accessible to you, because of OpenCAL.
CAL (computed axial lithography) isn’t intuitive in any respect, which might be why it isn’t commonplace in the present day. A CAL printer, like OpenCAL, consists of a laser projector and a rotating cylindrical vat of photosensitive resin gel. The half varieties within the vat, suspended within the gel. That takes lower than a minute and help constructions aren’t obligatory.
However how? How does the projector goal a selected distance vary to type the specified geometry?
Think about one thing like this string artwork (supply: Barton Dring)
The perfect analogy I can consider is string artwork made on a round board. On this analogy, every string is a ray of projected gentle. A lot of the board, when averaged out, has low string density. However the crossing strings make areas of excessive density that stand out to type a picture. For CAL printing, these can be the cured areas.
Mild shines via the whole vat, however not with a lot vitality. Solely the areas that get numerous publicity — the dense areas — obtain sufficient vitality to treatment and solidify. And a few geometry is not possible. Nonetheless, the advantages far outweigh the constraints in lots of use instances.
That is actually outstanding expertise. Precision and element are low right now, however that is cutting-edge stuff and there’s room for lots of enchancment.
Within the just-published documentation from UC Berkeley in regards to the OpenCAL V2, the said construct value is about $1,638. I feel that’s very cheap, contemplating what you’re getting.
$600 of that value is only for the laser projector. The remaining, nonetheless, is surprisingly mundane. We’re speaking fasteners, aluminum extrusion, and a stepper motor — the sort of stuff you’d purchase for any 3D printer construct. So, savvy sourcing can convey the fee down quite a bit.
The resin gel, nonetheless, is something however customary. It isn’t one thing you should purchase off-the-shelf and although there are directions for mixing it, that’s hazardous and isn’t protected for hobbyists to do themselves at house. Fortunately, it seems that the OpenCAL staff will probably be partnering with Formlabs to combine the resin and MatterHackers to promote the resin.
My advice can be to attend till that’s obtainable. However when you’re ready, you’ll be able to begin constructing your individual OpenCAL V2 printer.