- Just in case anyone interested or has any feedback, here is a little
progress report on my printer build. (Maybe some one is working on a
Starting with a server rack enclosure as they are the perfect size for
what I wanted and quicker and cheaper than building up and enclosed
rigid but accessible enclosure.
Projector(s) will be mounted at the top shining down. To start with I
will not have a wiper but simply drive the print job down deep and then
bring it up and wait for resin to level out. Thinking about some custom
software to workout surface area geometry to optimise wait time for
levelling. That is obviously a large flat area (or enclosed area) will
take longer to level than a small or thin section.
So far I have Purchased:
Server Rack cabinet 44RU
25mm diameter Linear rails and carriages (crap round Chinese ones, bit
too much play but will do to start with, will upgrade to better
tolerance rails, or ad pre-load bias mechanism once it's up and running
ball lead screw
Projector, was going to go 1080 res but at half the cost I got a single
768 res that is just as bright, so better to use multiple low def units
arrayed, to get the both the coverage, definition and brightness.
Front surface mirror to fold beam down, so that project is horizontal
Ordered laser cut SS brackets to mount rails and lead screw
Solarez UV activator for polyester resin.
Polyester resin and styrene monomer to experiment with viscosity.
I have nema 23 stepper motors on hand and quality micro-stepping drivers.
See attached image of the basic layout in cad (alibre)
To start with I will test with an ice cream container but the plan is to
scale up to a 400 x 600mm vat about 600mm deep. So that is why I'm
using the large cabinet and large rails etc
I have tested Solarez resin with projector and I'm getting 3mm thick
layer in about 3 minutes (no dye yet) With projector at unmodified
closest focal length so about 1 meter away.
Hoping to print large usable any products that we currently manufacture
from cnc cut flat sheets of PVC and then hand assemble. The basic
samples we have made from simply shining the projector into the resin
while displaying a static image, producing 3mm thick layer have proven
to be very structural, as good as PVC. So fingers crossed it works.
Looking like the resin will cost about 1000AUD to fill the full size vat
up, if the polyester and solarez solution continues to work as well as
Regarding compensating for the resin displacement as the platform and
arm are lowed into the vat, i will either use a compensation block
(using a pulley to pull it out as the platform dives in, or more likely
I was thinking that simply having a overflow point would work, obviously
this needs to have minimum surface tension to be accurate, something
else to test.
Good luck with all your builds.
Tecevo - Australia