3d printed dies undersized, a mystery for the ages.

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mmbh

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Yes and every which way between. We stopped bothering with the removable dies entirely and were doing just a solid model and an individual die for checking margins.
Us too. In fact most of the time we don't even use a die anymore for the digital cases. Just solid for contacts.
 
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grantoz

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i found asiga max and asiga model resin very reliable and removable dies fit
 
HonestAbe

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Still working on this, don't have much of an update as I've been working with the old scanner and computer this week. I have a few tests lined up for tomorrow. Going to do some single dies, middle of platform, maximum (25 micron) detail. Interestingly my boss showed me a gold crown that fit the margins on a solid model printed at 100 microns perfectly. I joked with him that now when the doc goes to seat it, the crown will be oversized and the model will be correct.. this stuff is incredibly promising and frustrating at the same time.

I really appreciate everyone's input and help and suggestions. I'm trying to do very specific tests but it's difficult in our lab (small and busy, moving lots of units). Sometimes if I'm not chasing my little tests everyone one gets past me before I can analyze it.
 
HonestAbe

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So printing dies on the form2 in the middle of the platform, 25 microns, yielded a much more accurate margin but not accurate enough to really trust it. The die still looks slightly smaller than it should be. I will report back when I hear what formlabs has to say about it and if there's anything else we can tweak on it. I just know there's going to be a case where I want to check the margins of a gold crown and can't because I don't have a model I can trust (if they send in a scan instead of an impression)
 
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sirmorty

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Form 2? that might be asking too much from that printer to print dies accurately.

Might be time to invest in something better.
 
HonestAbe

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Sadly that's what we've got and after a recent upgrade of scanner/mill/sintering furnace I don't think it's in the card for a while.

The only other thing I can think to try is to minimize the amount the sirona model app is ditching the die, and then instead of printing it on a raft I could take it into meshmixer and cut the indexed part off the bottom and print it solid and flat on the surface of the plate.
 
tehnik

tehnik

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There is better accuracy on a 400 dollar lcd printer than form2. Also you can find cheaper resin for those, not to mention the trays.
 
bigj1972

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Dental-Model-Resin.jpg
Remember when these were 10K? All the rage at the trade shows. In every publication.
"Oh so accurate." "Don't be left behind."
 

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