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#1 2019-03-15 02:50:03

0x6c23
Member
Registered: 2018-05-12
Posts: 12

No X/Y percentage available anymore? Wrong print dimensions

So since the x/y percentage override was removed in the latest version, how am I supposed to dial in my dimensional accuracy?
My prints come out 20.3 / 20.4 instead of 20mm.

Also, how is the formula to calculate the new resolution? I have 47.25 as x/y resolution, a 10x10 cube gets displayed correctly as 10x10 rectangle on the screen, still always 0.3 more in x/y axis.

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#2 2019-03-15 07:18:32

Shahin
Administrator
Registered: 2016-02-17
Posts: 2,541

Re: No X/Y percentage available anymore? Wrong print dimensions

There is X,Y override at the end of profile page. We had too many input boxes effecting size of pieces and it become to confusing to use and guess how they will interact with each other.
Use 45.83 as override value.

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#3 2019-03-15 10:32:37

0x6c23
Member
Registered: 2018-05-12
Posts: 12

Re: No X/Y percentage available anymore? Wrong print dimensions

Thanks for the answer. Could you please explain how you come up with 45.83?

Also, can I use dynamic calculation with raspberry pi & mks gen 1.4 + polulu stepper driver?

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#4 2019-03-15 18:49:42

0x6c23
Member
Registered: 2018-05-12
Posts: 12

Re: No X/Y percentage available anymore? Wrong print dimensions

After changing the override to 45.83 my prints come out at 10.8 instead of 10.

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#5 2019-03-16 06:40:31

Shahin
Administrator
Registered: 2016-02-17
Posts: 2,541

Re: No X/Y percentage available anymore? Wrong print dimensions

Sorry I have miss read your post. So your print no matter what size, came out 0.3mm larger right?

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#6 2019-03-16 08:44:35

0x6c23
Member
Registered: 2018-05-12
Posts: 12

Re: No X/Y percentage available anymore? Wrong print dimensions

Yes, that is correct.

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#7 2019-03-16 12:25:22

Shahin
Administrator
Registered: 2016-02-17
Posts: 2,541

Re: No X/Y percentage available anymore? Wrong print dimensions

Are you sure it is not effect of over-cure?

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#8 2019-03-16 12:44:04

0x6c23
Member
Registered: 2018-05-12
Posts: 12

Re: No X/Y percentage available anymore? Wrong print dimensions

Yes! I tried many cure times, from 4 seconds to 8 seconds in 1/2s steps. All the same.
But I get perfect results now. A 10mm cube comes out at around 10.07mm, which is good!

I am using 48.23 as override value. I worked my way up from 47.25 with this formula: res / ( 1 - percent / 100), where percent is the size diff of the print, so 10.30 mm / 10mm = 1,03, so:

47.25 / (1 - 1,03 / 100) = 47,74 <- this got me to around 10.20mm, and I did it again
47,74 / (1 - 1,02 / 100) = 48,23 <- 10.07mm, great!

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#9 2019-03-17 17:41:33

DrNK
Member
Registered: 2016-11-19
Posts: 83

Re: No X/Y percentage available anymore? Wrong print dimensions

What is your FEP thickness and  do you have glass betwenn lcd and fep?

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#10 2019-03-17 22:57:45

0x6c23
Member
Registered: 2018-05-12
Posts: 12

Re: No X/Y percentage available anymore? Wrong print dimensions

I tried 0.1 and 0.2mm FEP sheets. Yes, I do have a glass between LCD and FEP, it's the standard glass which comes with the display, like on the wanhao d7.

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#11 2019-03-18 07:11:21

DrNK
Member
Registered: 2016-11-19
Posts: 83

Re: No X/Y percentage available anymore? Wrong print dimensions

UV light goes through open lcd pixel and then through  500 microns protective glass and 100-200 microns film. Tbere are the space for loosing dimention accuracy

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#12 2019-03-18 11:48:06

Xmike
Member
Registered: 2016-03-25
Posts: 97

Re: No X/Y percentage available anymore? Wrong print dimensions

For such cases, scaling does not help.
A setting option for a contour offset as offered by Creation Workshop would be better here,
In CW therefor was the option "Outline With Inset" and "Outset (pix)".
In Nanodlp I cant find a comparenes Option, but would be great.

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#13 2019-03-22 11:53:23

MaxJewels
Member
Registered: 2017-08-10
Posts: 64

Re: No X/Y percentage available anymore? Wrong print dimensions

0x6c23 wrote:

Yes! I tried many cure times, from 4 seconds to 8 seconds in 1/2s steps. All the same.
But I get perfect results now. A 10mm cube comes out at around 10.07mm, which is good!

I am using 48.23 as override value. I worked my way up from 47.25 with this formula: res / ( 1 - percent / 100), where percent is the size diff of the print, so 10.30 mm / 10mm = 1,03, so:

47.25 / (1 - 1,03 / 100) = 47,74 <- this got me to around 10.20mm, and I did it again
47,74 / (1 - 1,02 / 100) = 48,23 <- 10.07mm, great!


much easier to do

(10.3 = + 3%)
10.3 - 3% = 9.991 (if you want more precision, make a slight manual correction at 2.9% and you'll get a piece of 10.0013 mm.)
then

47.25 + 3% = 48.667    (47.25 + 2.9% = 48.620)

if instead the piece should be enlarged rather than reduced, the operation will be

47.25 - X% =

Last edited by MaxJewels (2019-03-22 11:59:13)

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#14 2019-03-22 14:50:32

Xmike
Member
Registered: 2016-03-25
Posts: 97

Re: No X/Y percentage available anymore? Wrong print dimensions

If the dimensional deviation arises due to the scattering effect of the light,
then the dimensional deviation is constant and can not be scaled down.
If you get 10,3mm from 10mm, 100mm becomes 100.3mm.

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#15 2019-03-23 08:35:47

MaxJewels
Member
Registered: 2017-08-10
Posts: 64

Re: No X/Y percentage available anymore? Wrong print dimensions

Xmike wrote:

If the dimensional deviation arises due to the scattering effect of the light,
then the dimensional deviation is constant and can not be scaled down.
If you get 10,3mm from 10mm, 100mm becomes 100.3mm.


99% of the time it is not the fault of the dispersion of light, but of the resin that expands too much or too little

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#16 2019-03-23 09:03:03

MaxJewels
Member
Registered: 2017-08-10
Posts: 64

Re: No X/Y percentage available anymore? Wrong print dimensions

Xmike wrote:

If the dimensional deviation arises due to the scattering effect of the light,
then the dimensional deviation is constant and can not be scaled down.
If you get 10,3mm from 10mm, 100mm becomes 100.3mm.


99% of the time it is not the fault of the dispersion of light, but of the resin that expands too much or too little

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#17 2019-04-05 08:12:24

Shahin
Administrator
Registered: 2016-02-17
Posts: 2,541

Re: No X/Y percentage available anymore? Wrong print dimensions

Erode / Dilate function added to compensation the difference.

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