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The parts here are identical with the exception that one was printed probably 8-10 months ago and one was printed 2 days ago. The old one was a stock LRP with my old batch of resin. The new one is on a LRP with the flexvat and new resin. Certainly the old one would have been more cured over time just from sitting around but neither have been in a UV oven or anything to post-cure.
You can see the one on the right is a different color (not a problem, it's just a little older) but in person it's noticeably more translucent.
Trying to catch the thin wall area (maybe 0.8mm or so wall) with a light behind it... old one:
New one:
The light REALLY shines through the newer one. I wouldn't have expected this to be a cure time issue; this seems like a resin issue. Any thoughts on that? Do these get more opaque as time goes on?
I usually use a syringe to suck up resin from the bottle and squirt it into the plate, and I really think it looks different- I wonder if it's just due to age or a change in formula.
Statistics: Posted by Scatterplot — Fri May 12, 2017 11:28 am
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I'm definitely seeing a little bit of light bleed right now but I know it's not significant overexposure. I ran the exposure test at 1 second increments and ended up needing at least 11 or so seconds; I tested in 1 second increments and didn't dial it in SUPER tightly but it's at least within a second or so (10%).
I'm starting to wonder if my projector has a bad bulb or something- might be time to rig up a light meter
Edit: A main reason I asked this was because the resin itself looked much thinner than I remembered, and I was wondering if MakerJuice had changed their formula. I didn't want to waste 10 hours tracking down a non-existent bug because MakerJuice changed some slight thing with their resin. I'd heard they were going to start using dies instead of pigments to fix settling issues and didn't know if that was a rumor or if I just misunderstood something.
Statistics: Posted by Scatterplot — Fri May 12, 2017 11:07 am
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Also, how sure are you of your exposure time? I don't have experience with MakerJuice SF specifically, but significant light bleed could indicate overexposure. I've been using B9 Emerald, off and on, for a bit over a year for jewelry work. I recently discovered that I've been using waaay too long an exposure time -- I'd been using 3 s for the past year, but found that I can print successfully with ~1.2 s of exposure. I used to have trouble with parts coming out over-thick and with fine details filled in (i.e., light bleed), but with the correct, shorter, exposure that's mostly fixed.
Statistics: Posted by Mattasmack — Thu May 11, 2017 7:55 pm
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Did you ever try switching back to petri after you were having troubles with the original resin and flexvat?
Statistics: Posted by C3DC — Thu May 11, 2017 2:33 pm
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About 6 months ago I got a FlexVat and installed it with no issues. It had been a good while since I'd used the printer, and the focal distance was a bit different, so I had some trouble with my initial prints; I had cure times around 11-12 seconds and was still having some trouble, so I figured my resin had gone bad and I ordered a new batch a couple of months ago for a project that got bumped to this week.
I opened up my Red last night after shaking it hard for a couple of minutes and put some in my vat. It seemed to be noticeably more translucent than I remembered my original batch of Red being. I did a calibration test and found that it, too, seemed to need about 12 second cure times to get a decent layer.
I did a normal print with it but a 35 mm tall object took around 5 hours, and it had enough light bleed around some thin gaps (0.010"-0.015") to close them up completely. The finished parts seem a bit more translucent than I remember as well.
Did Makerjuice change their formula? Could my projector (Acer 6510BD) need a new lamp already (after roughly one liter of use)? Any other thoughts on my very long cure times and translucent parts?
Statistics: Posted by Scatterplot — Thu May 11, 2017 11:26 am
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