Issue with PDMS

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Nitros
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Issue with PDMS

Postby Nitros » Tue Sep 06, 2016 7:57 am

Hi All,

I have an issue with FDM everytime i print it fail as the FDM film break and the result is as the pics shown.

Anyone knows how to solve this problem?

Thank You
IMG_20160906_125940.jpg
IMG_20160906_125927.jpg
IMG_20160906_124232.jpg
Last edited by Nitros on Sat Sep 10, 2016 11:01 am, edited 2 times in total.

Nitros
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Re: Issue with PDMS

Postby Nitros » Tue Sep 06, 2016 7:58 am

IMG_20160906_124232.jpg
Last edited by Nitros on Sat Sep 10, 2016 11:02 am, edited 1 time in total.

Nitros
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Re: Issue with PDMS

Postby Nitros » Tue Sep 06, 2016 8:18 am

Last edited by Nitros on Sat Sep 10, 2016 11:02 am, edited 1 time in total.

Nitros
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Re: Issue with PDMS

Postby Nitros » Tue Sep 06, 2016 4:56 pm

Last edited by Nitros on Sat Sep 10, 2016 11:03 am, edited 1 time in total.

Nitros
Posts: 85
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Re: Issue with PDMS

Postby Nitros » Sat Sep 10, 2016 10:59 am

I'm trying again with a new PDMS, I stop it on time as I noticed the build plate was starting to stick, and here the pic, I think the exposure is to strong that burn the PDMS?
IMG_20160910_150413 (1).jpg
Capture1.PNG
Capture.PNG

cew
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Re: Issue with PDMS

Postby cew » Sat Sep 17, 2016 4:56 am

As you say probably too much exposure. Some quick suggestions:

I find the base settings and calibration pegs from the littlerp site useful for setting exposure.

Set it just enough so that all the pegs print across the build platform.

Keep retraction rate high ~200mm/min

Nitros
Posts: 85
Joined: Fri Jul 01, 2016 7:27 am
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Re: Issue with PDMS

Postby Nitros » Sat Sep 17, 2016 1:27 pm

What's wrong with this pics?
IMG_20160917_185335.jpg

cew
Posts: 28
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Re: Issue with PDMS

Postby cew » Sat Sep 17, 2016 6:44 pm

This looks promising.

The method I use for setting 'just enough' exposure across the build platform is:

Lower exposure so only the center pegs are printing ok and the outer pegs only partially form.
Nb to save time you often only need to print a few layers to see this. Initially you can check via the mirror.

Boost exposure until the outer pegs just print ok. Typically this is about ~20% longer exposure.
When you are close you can check the diameter of the pegs for consistency (2mm).



The build platform an print alignment can be corrected by adjusting the height of projector and refocusing.


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