whats your strategy for tuning demensions April 07, 2014 01:14PM |
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Re: whats your strategy for tuning demensions April 07, 2014 03:57PM |
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Re: whats your strategy for tuning demensions April 07, 2014 07:11PM |
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Re: whats your strategy for tuning demensions April 07, 2014 07:18PM |
Registered: 13 years ago Posts: 2,947 |
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Bill Clark
interesting. I thought it would be more or less flow assuming the error was a result of the extrusion width but actual travel adjustment would have the same effect without altering the extrusion proccess. see, I'm learning. thanks
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Re: whats your strategy for tuning demensions April 08, 2014 05:33AM |
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Re: whats your strategy for tuning demensions April 08, 2014 12:33PM |
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Re: whats your strategy for tuning demensions April 08, 2014 12:39PM |
Registered: 10 years ago Posts: 553 |
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Sublime
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Bill Clark
interesting. I thought it would be more or less flow assuming the error was a result of the extrusion width but actual travel adjustment would have the same effect without altering the extrusion proccess. see, I'm learning. thanks
Never change your X or Y steps per mm based on a print. Test how far the axis moves using a dial gauge or digital callipers to set the X and Y steps per mm if you can not use the belt and pulley sizes to get the X and Y steps per mm correct. If the print is coming out too large after getting the steps per mm correct then it will be an E steps per mm issue (or flow modifier in the slicer).
Re: whats your strategy for tuning demensions April 08, 2014 01:07PM |
Registered: 13 years ago Posts: 2,947 |
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gmh39
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Sublime
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Bill Clark
interesting. I thought it would be more or less flow assuming the error was a result of the extrusion width but actual travel adjustment would have the same effect without altering the extrusion proccess. see, I'm learning. thanks
Never change your X or Y steps per mm based on a print. Test how far the axis moves using a dial gauge or digital callipers to set the X and Y steps per mm if you can not use the belt and pulley sizes to get the X and Y steps per mm correct. If the print is coming out too large after getting the steps per mm correct then it will be an E steps per mm issue (or flow modifier in the slicer).
I've tried it both ways and have gotten good results from both. Any reason why you should base off none-printing movement?
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Re: whats your strategy for tuning demensions April 08, 2014 02:03PM |
Registered: 12 years ago Posts: 99 |
Re: whats your strategy for tuning demensions April 08, 2014 05:18PM |
Registered: 13 years ago Posts: 2,947 |
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ikilledkenny
Personally I do a combination of the 3 (calculate steps, adjust flow, & measure)
Step 1 is to set the X & Y based on calculated steps/mm.
Step 2 I will verify my e-steps and perform a single wall extrusion test to verify flow. Like someone mentioned each material has a different shrink rate. If you plan to print with different materials make sure to do this test for each one.
Step 3 I will print a 25mm cube, as well as a right angle "L" that is 150mm in the X and Y. In my experience I have gone round-n-round with dialing in dimensions using flow, only to have dimensions vary. Now everything has a tolerance to it, and where math is perfect manufacturing processes are not so much. I found that verifying dimensions over a range of distances can help show if there is % error. A 25mm cube is a small percentage of actual print volume. If your machine is producing a % error over distance you may not notice this on small calibration cube but larger objects you will.
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Re: whats your strategy for tuning demensions April 09, 2014 02:25PM |
Registered: 12 years ago Posts: 99 |
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Sublime
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ikilledkenny
Personally I do a combination of the 3 (calculate steps, adjust flow, & measure)
Step 1 is to set the X & Y based on calculated steps/mm.
Step 2 I will verify my e-steps and perform a single wall extrusion test to verify flow. Like someone mentioned each material has a different shrink rate. If you plan to print with different materials make sure to do this test for each one.
Step 3 I will print a 25mm cube, as well as a right angle "L" that is 150mm in the X and Y. In my experience I have gone round-n-round with dialing in dimensions using flow, only to have dimensions vary. Now everything has a tolerance to it, and where math is perfect manufacturing processes are not so much. I found that verifying dimensions over a range of distances can help show if there is % error. A 25mm cube is a small percentage of actual print volume. If your machine is producing a % error over distance you may not notice this on small calibration cube but larger objects you will.
Ok so here is the problem with that. Lets start from the end of my last example assuming we are calibrated to print the 20mm cube. Now when we print the 200mm cube we need to readjust the X and Y steps per mm so it prints correctly. Great we can now print a 200mm cube the correct size but when we print a 200mm cube 2mm thick with a 20mm cube on top of it in the middle we have the 200mm part correct but the 20mm part is wrong. How do you change the X and Y steps to account for both. You can't so all you can do is have the axis calibrated to move the correct distances and rely on the coordinates as calculated by the slicer based on the model and then use the features of the slicer make any changes. I for one use Kisslicer and Cura and all of my prints are within 50micron of the correct size (even the small holes) as long as I use a layer height below 0.25mm as large layer heights cause all kinds of issues with accuracy.
Re: whats your strategy for tuning demensions April 11, 2014 08:15AM |
Registered: 11 years ago Posts: 251 |
Re: whats your strategy for tuning demensions May 02, 2014 01:06PM |
Registered: 10 years ago Posts: 239 |