3D sizing question... Chitubox slicer

[V8tiger]

I'm relatively new to this and I've received my Mars 3 Pro a few days ago and just printed out the test towers that come with the unit... My question is this: I downloaded a sti file of a Crager Mag wheel.. How do I down size it in the slicer program to make it print out 1/25 scale... I see where I can scale it larger or smaller.. should I measure a 1/25 scale wheel in mm and use that measurement then input it into Chitubox?? That seem like the logical thing to do.... Thanks in advance guys...

[stitchdup]

there should be an option to scale the item in the slicer and it will probably work in percentages. I find this site useful   http://www.scalemodelersworld.com/online-scale-converter-tool.html  . down at the bottom of the page is the tool i use for finding out the percentages to resize with

be careful too when rescaling items, down sizing them can make the surfaces of the parts too thin to be usable. andif making parts bigger surfaces that were smooth can become blocky

[V8tiger]

Thank you very much..

[Jiml0001]

If you want 3D print scaling to be super simple use the formula that one inch in real life equals one millimeter in scale.  I use this for both 1/24 and 1/25 scale.  So a 17 inch rim is 17 millimeters on the printer.   Chitubox let’s you scale by measurement as well as percentage so just scale your 17 inch rim to 17 millimeters.    I’m sure there are people screaming out there but we can do the math all day and the differences are tiny.     And before you scream too much about fidelity spend some time with your dial calipers measuring kit parts against actual manufacturers specs like I did and you won’t find many kit parts that are correct.  I looked at engine block measurements, distributors, carb flanges, oil filters and many other items and found kits were all over the place for accuracy.  
 

so I use the one millimeter equals one inch rule and not only does it make scaling consistent and easy but the results have all the parts in correct proportion to each other

 

[Oldriginal86]

  On 5/3/2023 at 2:50 AM, Jiml0001 said:

If you want 3D print scaling to be super simple use the formula that one inch in real life equals one millimeter in scale.  I use this for both 1/24 and 1/25 scale.  So a 17 inch rim is 17 millimeters on the printer.   Chitubox let’s you scale by measurement as well as percentage so just scale your 17 inch rim to 17 millimeters.    I’m sure there are people screaming out there but we can do the math all day and the differences are tiny.     And before you scream too much about fidelity spend some time with your dial calipers measuring kit parts against actual manufacturers specs like I did and you won’t find many kit parts that are correct.  I looked at engine block measurements, distributors, carb flanges, oil filters and many other items and found kits were all over the place for accuracy.  
 

so I use the one millimeter equals one inch rule and not only does it make scaling consistent and easy but the results have all the parts in correct proportion to each other

 

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I’ve just adopted this system and it makes fabricating parts much more to scale. I still go with the “that looks right” every once in a while.