Translucent PETG

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sTaLa
Posts: 43
Joined: Tue Jun 14, 2016 3:01 am

Re: Translucent PETG

Post by sTaLa » Tue Sep 20, 2016 2:24 am

zemlin wrote:I just updated the Calibration Cross, btw. Glad to see someone using it. Hope you find it helpful.
viewtopic.php?f=3&t=3885&p=29102#p29102
Yeah the first time I designed one with multiple holes of different diameters. But I quickly found that the shrink factor was not the same depending on the size of the hole. I was looking for a way to apply a general factor that would allow to have a part pretty much into specs.

Then I found your cross with the Excel table. That saved me time thank you very much for that!!!

sTaLa
Posts: 43
Joined: Tue Jun 14, 2016 3:01 am

Re: Translucent PETG

Post by sTaLa » Tue Sep 20, 2016 2:59 am

Here's my 70 hour print in PETG!

That thing reallys is filled with air channels. I am going to use it to insert labels into injection molding molds and then pick up parts.
0026 - Mandrin 1L (2).jpg

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Jules
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Joined: Wed Jan 21, 2015 1:36 am

Re: Translucent PETG

Post by Jules » Tue Sep 20, 2016 4:00 am

Great job!

sTaLa
Posts: 43
Joined: Tue Jun 14, 2016 3:01 am

Re: Translucent PETG

Post by sTaLa » Wed Sep 21, 2016 1:24 am

Thanks Jules!
I am running into some issues though. I was worried this could happened and should have run some trials first, but I was optimistic.
My air channels are sadly not air tight. I need to find a way to solve this.
You can see what I am talking about here: viewtopic.php?f=2&t=4466

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Jules
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Re: Translucent PETG

Post by Jules » Wed Sep 21, 2016 2:16 am

Yeah, you're going to have to seal it somehow. 3D printing isn't air-tight.

XTC-3D maybe? Or spray varnish? Hmmmn......

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jimc
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Re: Translucent PETG

Post by jimc » Wed Sep 21, 2016 2:20 am

yes 3d prints arent water or air tight. atleast not 100%. you could maybe dip it in epoxy but that would be really expensive, messy and a pia to make sure the epoxy doesnt run, collect and end up blocking one of you air channels.

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zemlin
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Joined: Thu Feb 04, 2016 9:32 pm
Location: Indianapolis, Indiana

Re: Translucent PETG

Post by zemlin » Wed Sep 21, 2016 1:42 pm

I have some EASY CAST 2-part epoxy I got at Michael's craft store. It's low viscosity and paints on pretty easily. The down side is the long cure time. I have used that to seal up some areas of PETG parts. It's thin enough you could probably pour/syringe it into your part and then pour it out if areas are inaccessible. An air-blast through the ports would probably work to clean out excess.

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