> On Wednesday 27 June 2012 14:04:15 John Stewart did opine:
>
>   
>> Hi all;
>>
>> Noted lots of interest in 3D printing, and have saved the emails.
>>
>>     
Michael Joyce just completed a kickstarter project for a 3D
printer, he got $510,000 in one month.  He now has to deliver
about 180 systems.  This is the b9creator project.
A lot of discussion of this type machine has been going on on
the Yahoo group :
diy_3d_printing_and_fabricat...@yahoogroups.com

The basic idea is a vat of photosensitive resin and a build
platform that raises above the vat.  A DLP-type computer
projector shines through the bottom of the vat to expose a
layer at a time, which is made planar by the vat bottom.
A guy in Spain is providing relatively inexpensive resins.
Software has been modified from the standard reprap software
preview mode.  The last problems that Michael solved was
preventing the model from sticking to the vat bottom (a clear
silicone similar to RTV was used) and preventing a suction
cup effect (his scheme is to have a plateau of the silicone
for the build area and slide the model sideways to a lower
area of the floor to prevent suction.)

The advantage of this machine is it exposes an entire
layer in parallel, and has about an 8-10 second cycle time,
regardless of layer complexity.  Pixels of 50 - 100 um
are typical, and layer thicknesses of 20 - 50 um are
what they are using, I think.

Pretty much all the details have been hashed out on that
group.

Jon

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