Smallest Support Tip Diameter that can be used?

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cerriousdesign
Posts: 57
Joined: Wed Nov 26, 2014 8:19 pm
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Smallest Support Tip Diameter that can be used?

Postby cerriousdesign » Fri Feb 12, 2016 11:49 pm

What is the smallest support tip diameter that can be used in Meshmixer for the Little RP. Right now I am using 0.37, the default is 0.30 for Meshmixer in the SLA dialogue box. The problem is I get little divots where I break the tip off at, which then becomes a surface defect. Would it be better to UV the model first then break/cut them off. Are there any tricks to this?

cew
Posts: 28
Joined: Tue Jan 05, 2016 5:36 am
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Re: Smallest Support Tip Diameter that can be used?

Postby cew » Sat Feb 13, 2016 1:19 am

I also have problems with divots, particularly if the supports are snapped off after UV. Below are some methods I use to reduce this problem:

- For fine parts I decrease the tip size from 0.34 to about 0.24mm diameter. I usually also increase exposure by about 25% and ensure the focus is accurate so these finer tips connect and support the part growth ok.

-Most parts I can orientate so the supports project on to a flat surface or base. Then I just snap them off and sand the surface flat with 800 grit paper.

- For some supports its useful to cut them off flush before the UV post cure. This can be slow work and either using a #11 scalpel blade or a fine pair of curved iris scissors under magnification.

james_lan
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Joined: Fri Apr 10, 2015 10:06 pm
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Re: Smallest Support Tip Diameter that can be used?

Postby james_lan » Mon Mar 07, 2016 1:13 pm

I get this sometimes with different materials. I don't recall it being a problem much with MS1 or MS2.

However, G+ Black and Red (Haven't tried anything else but blue... and let's say that blue is difficult to print with and to not have it turn into a nasty blob that ruins your print surfaces. The others aren't as high a resolution as the MS1/Red, but are still pretty good. I did mix it with red for a nice purple.) When you remove it with nippers it almost flakes off like what you'd see on a rock after flintknapping. Usually, I make the supports on the bottom or other places they won't be seen.

In the case that it does screw up, and leaves a divot some place that's visible (most of the things I'm doing in G+ have rounded or flat convex shapes.) I'll put a drop of resin on it, and use a handheld blue laser to cure it, then sand it off until smooth. If it's just extra support, a small file works great for removing it.

(That laser trick also works for broken parts. Or unbroken parts that you want to join together.)


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