When doing a design with a circle on a mug. When I finish the mug and measure the circle the height and width are exactly the same. Except visually it looks like the circle is elongated vertically. Is the a way to correct for this without stretching the design horizontally
As there is no âcylinder correctionâ tool in LB at present for GRBL devices.
Check out this video
I figured it out. If you measure the top of the mug and move the decimal point over one to the left. Then add that dimension to the width of the design, now the circle will look visually correct. A little bit different method than what the video above shows but much simpler.
Example:
My design was 58.7mm x 58.7mm
The top of my mug measured 87.0mm
So i added 8.7mm to the width (Height since its rotated) of my design
58.7mm
+8.7mm
=67.4mm
The design will look stretched in Lightburn.
But visually it will look correct when viewed straight on on the mug
This method is not perfect and you may have to adjust this formula but the circle now looks much better visually even though it is stretched.
A little more testing and at least on the mug i was using the stretch needed was a little less than 10%. More like 8% for the best results
LightBurn already has a taper warp calculator in recent versions, you find it in the tools menu:
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Thanks, ill check out the taper warp function. But I donât think that would help me with the circle issue.
Itâs all about perspective. A small round logo on a specific diameter tumbler will look closer to correct than a large round logo on that tumbler. Notice how the circle of stars in the center look correct.
The problem is compounded the smaller the diameter of the tumbler. Adding 10% to the width is a good starting point, but it varies with the logo size and tumbler diameter. The best way to get it to look correct in my opinion is to print the logo on paper and wrap it around the tumbler. Adjust the width and print it again. Keep adjusting and printing until you get the look that works for your situation.
There are formulas to figure this out, but I like to go by my eye because the formula may provide the exact amount of distortion to get a perfect circle when viewed straight on, but you typically donât view it perfectly straight on. Therefore I go by what I think looks âmost correctâ.
The taper warp function does work well for adjusting for the taper of your tumbler, but it doesnât account for the cylindrical shape. Taper warp is most evident on a logo with vertical sides, less so on a round logo, but I would stll use it with your tumbler in addition to distorting the width.
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Good advice. Thanks. I donât have Taper Warp function in my version so i would have to do it manually. But your correct, taper warp would be useful if printing something with square sides but not so much for a pure circle.
Shrink it vertically.
Sorry, not trying to be a sarcastic jerk. Just pointing out that if you donât want it to wrap around the mug further, the other option is shrinking the vertical height.
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Either way should work. But the formula only works if you are stretching the width
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