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What is the best way to change the scale of an object from one scale to another? 
I recently downloaded a 3d print model that was noted as being in 1:64 scale, and I wanted to change it to 1:48.

I found a web site scale-modelers-handbook with a table listing different scales.

Using my rusty math I divided the values in the last column, 15.62mm by 20.83 = .7498

My understanding is the I would need to increase the original model by 25% to have a 1:48 model.

This is based on the slicer software ability to scale a selected object by %

Am I missing anything?


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I noticed you were working on the Jeep card.  I happened to be working on that as well.  I did a test print of the original size and then measured and scaled it up to O-scale.  The real JEEP was 10' 10" long or roughly 2.75" in O-scale.  Scaling up the model got me to an O-scale JEEP.

Jeeps

It's good enough that I think I'll invest in the olive green filament and print some for flatcar loads.  I actually may print the canvas top separately in a slightly different color, and print the tires in black.

I can fit three of the O-scale cards on my build plate.  I may remove them from the card so I can print them four at a time.

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I regularly do the math to convert 1:1 in feet and inches to 1:48 in millimeters.  Long story if you haven't followed my posts on the forum.  I set up a cheat sheet in Excel to do the math for me for converting both directions.  I got tired of writing out the algebra on it.  My 28-year-old daughter who teaches high school calculus would be appalled. 

Here ya go...from the OGR 3D Catalog website.

SCALE CONVERSION RATIOS

FROM

TO

#1 scaleO scaleS scaleOO scaleHO scaleTT scaleN scaleZ scale
#1 scale (1:32)150%200%238%272%375%500%688%
O scale (1:48)67%133%158%181%250%333%458%
S scale (1:64)50%75%119%136%188%250%344%
OO scale (1:76)42%63%84%115%158%211%289%
HO scale (1:87)37%55%73%87%138%184%253%
TT scale (1:120)27%40%53%63%73%133%183%
N scale (1:160)20%30%40%48%43%75%138%
Z scale (1:220)15%22%29%35%40%55%73%
Last edited by Rich Melvin

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