May I ask if there is a solution? The accumulation of angles is causing me a lot of trouble and difficult to repair
It looks like you are printing fairly small parts with very large touchpoints relatively speaking. You may have luck reducing the touchpoint size ~30-5% and adjusting the quantity to get a better outcome.
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I tested two, one with placement support and one without, but the results were not significantly different
i would try maybe a different angle or even up and down have you tried it with mini rafts. I’m not 100% sure where the issue is in the image.
If you post a .stl or .form file of the part/job that would help as well. The issue is still unclear as Matt mentioned.
From what I’m deciphering from the images, (correct me if I’m wrong), you’re saying there an accumulation of cured resin in that inner angle where there shouldn’t be, resulting in parts not fitting together, right?
Adding on to what Matt mentioned, you can try orienting your part differently, as underhangs with or without supports are less reliable from a dimensional accuracy standpoint. If you can share the part I’m happy to take a look and see if I can understand your situation a bit further.
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@barreax2 @henryqiu https://drive.google.com/file/d/18su0tYQP1WiglCaG4ykd2ELcvr55CHAD/view?usp=sharing
Gotcha. And what are the difficult-to-repair issues that this is causing? Uncured resin in contact with the part should not affect its dimensional accuracy as long as you wash the parts thoroughly before curing. Could you walk me through your print to post processing workflow, the issues/trouble that this “reverse cupping” is causing, and your current workaround to repair the issues? Thanks!
I nearly always use one of these to clean out hard to wash areas (bolt holes, cavities etc) prior to curing. Will probably help you out as well.
Spray Bottles
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Interesting. I ran a test print on one of them with your orientation and saw a similar issue. I reorientated similar to below and that seemed to clear up the issue for me at least.
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@maizi, I would suggest changing the orientation to eliminate the unwanted cured areas. Also, be sure to wash your parts for 5 minutes in at least 90% IPA, then I suggest using the spray bottle to get inside where the supports are to ensure that there is no resin collected inside. With these models, you could probably remove them from supports before curing, which will help you make sure that it’s nice and clean in there before the cure actually happens.
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@jessbuck You didn’t understand what I meant. Solidification occurs during printing, not at the end of printing
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@jessbuck I can change the orientation of this model for printing, but what about the vertical holes or other similar parts
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@barreax2 100% vertical is the solution, but what about the holes。I am very troubled
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It’s a really small hole all being said, so it should form pretty well even without supports. It seemed like it formed well for me still, but I didn’t check circularity or have a reference dimension to check. You can always adjust the angle to find a better spot in between vertical and where you started (maybe 60-75deg) to optimize forming and the hole dimension. Alternatively, get rid of the hole altogether and drill it in after printing if it’s critical.
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There is resin accumulation and solidification here, and I am now sure that this is a design defect that can only be solved by changing the direction. The engineer cannot provide a solution