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Regarding the holes closing up, it is about balance and trying to balance the different features on the calibration piece. A quick an easy way to check your cure time with a known good resin is to focus on the columns. If you are mixing / playing with your own resins you will have control over adjusting the bleed level and this is where the other features are useful.
1 - Hole sizing
Each hole should be visible, due to the base layer being a longer cure the holes may not travel through the entirety of the part.
2 - Groove sizing
How deep do the grooves go? getting the thinnest groove to not fill in will be tough
3 - Text
Text shouldn't be too closed in, nor should it be enlarged
4 - Columns
We want the columns to be fully formed, the thinnest should have enough structure so that it can stand under its own weight without flopping over (this is the quick and dirty way to test cure time)
5 - body
The body of the calibration piece should be complete with a smooth surface, undercurring can leave you with a rough / eroded texture.
Statistics: Posted by goopyplastic — Wed Dec 31, 2014 12:16 am
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current size / expected size * build area = new build area
My build area in cw started at 102 and my first print measured 29.4mm of the 50 it was supposed to be so 29.4/50 = .588.... Multiply that ratio with the build area .588*102 = 59.976 I then just used the aspect ratio for the other length
There is a line but you are trying to cure as little as possible while maintaining detail. the more you cure in the printer the harder it is to peel, the faster you burn the pdms. So dropping the exposure time a little is likely a good idea, the worst that happens is the print doesn't hold up, and you know you need to raise the exposure up a little.
http://www.littlerp.com/?page_id=55 on this page under "Calibration STL Files" is calibrationgrid.stl the posts should be 50mmx30mm apart when measured with calipers.
I dont want to direct link someone elses dropbox file. thus the gymnastics
Statistics: Posted by Praesmeodymium — Mon Dec 29, 2014 12:22 am
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Statistics: Posted by HotRodTractor — Sun Dec 28, 2014 7:47 pm
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Anyway - I printed the calibration target block with the numbers and letters inset into it with the ramp. I measure the length of it and it comes in at 1.108" - if I am right the block is suppose to be 25mm long (1.020") - how do I correct for this? Change the "Build size" in Creation Workshop? I'm searching this forum for a bit more understanding. Thanks!
Statistics: Posted by HotRodTractor — Sun Dec 28, 2014 7:27 pm
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