Slight shift of layers

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noahbern
B9 Maker
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Posts: 374

Slight shift of layers

Post#1 » Wed Nov 12, 2014 8:51 am

I am printing this to the plate. What ever I do I am getting a slight
shift of one of the base layers or close to... Any help? I am using
an interesting setup....

.2 MSM
no saftey glass
12sec base
1.4 over .0043
31.7 slice



Any help... I dont think alot of people have the same setup on the v1.1
Any help would be GREAT! Thanks
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akgold
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Slight shift of layers

Post#2 » Wed Nov 12, 2014 11:19 am

show us you settings.
I'm so far behind I think I'm First !!

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Robert Howle
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Posts: 6620

Slight shift of layers

Post#3 » Wed Nov 12, 2014 2:55 pm

What resin, what machine, what xy and Z? No way to help without info. Like AK says need to see "print data" that u saved to the clip board. I get a little of this sometimes myself. Just never been enough to bother my prints since its only on the first couple of base layers and on some foundation disc. So I have spent no time to find the reason for the "flashing", for lack of a better term.

What do u mean "no safety glass"?

Robert
Dance like nobody's watching!

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noahbern
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Posts: 374

Slight shift of layers

Post#4 » Wed Nov 12, 2014 3:16 pm

Safety glass = glass filter
sorry i wrote that kind of fast.

I am using the 1:1 mix

other wise what other settings do you need?
b9 v 1.1 with the newest software...
50xy 31 z

Flashing is a great term for this!

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Robert Howle
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Posts: 6620

Slight shift of layers

Post#5 » Wed Nov 12, 2014 3:44 pm

When u go to "Help" at top when u open the app. Choose "copy last print settings to clipboard" then u can paste in the post to see all info at one time.
Dance like nobody's watching!

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tim.yoshi
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Slight shift of layers

Post#6 » Wed Nov 12, 2014 10:07 pm

So you removed UV filter from lamp or from projector itself?
Or maybe color wheel?
AFAIK in projector there is 3 UV filters! One on the lamp housing, second on the projector near the lamp assembly and third is on the color wheel. So if you removed only on filter and this gave you 0.2 msm I can't imagine what will be the speed if all three will be removed?
Also I heard that in place of this filter still need to be placed some transparent glass because heat from lamp could and will damage internals of the projector very soon.

P.S. Maybe movie-like speed (25-30fps) projection of slices to the kind of resin like MJR SubG (not G+) is possible and finished print in 5 minutes? :)
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tim.yoshi
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Slight shift of layers

Post#7 » Wed Nov 12, 2014 10:25 pm

I'm looking at picture and thinking - maybe it's reflected light from the base plate makes it bigger and blurred?

Try to lower base curing time to 5 seconds and see what will happen. Or try the following hack - glue to the build table some orange glass or acrylic - it should not reflect but absorb UV and blue light.
But not forget to calibrate properly.
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tim.yoshi
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Slight shift of layers

Post#8 » Thu Nov 13, 2014 6:34 am

I googled this topic and interesting results I found - looks like Ti tested their DLP's with UV and claim that even old models should survive UV at least for 2000 hours. Given 5x decrease in build time that's a lot of prints! Not to say that there is still hope that they improved UV resistance in newer chips which I hope are used on our both v1.1 and v1.2 machines. Anyway it's worse to test.

Here are the materials:
http://focus.ti.com/pdfs/dlpdmd/Digital_Projection_of_UV_Light_is_Enabling_New_Markets1.pdf

http://focus.ti.com/download/dlpdmd/152_NewApps_paper_copyright.pdf

This is likely about old xga in Vivtek D535:
http://www.ti.com/lit/an/dlpa031c/dlpa031c.pdf

Also need to know how much will cost local serviceman DMD replacement if it will be needed :)
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