To convert a 1:96 model to a 1:75 model divide the 96 by 75
96/75 = 1.28 multiply by 100 to get the % to print at. So print the 1:96 scale model at 128% to get a 1:75 model. A 1:96 scale model is smaller than a 1:75 model so printing at a higher % will get you the scale you want. Make sure the parts will fit on the largest size paper that your printer can handle.
Here is a small scale conversion calculator program. works good.
Starship Modeler - ScaleMaster Scale Calculator
To use the calculator to get the above conversion use the
Scale Conversion feature and enter
1 in the
Current Value window, choose
meters as the units, check
Display results in metric, enter the appropriate scales in the scales windows, then click the
Convert Value button. The result will be displayed in meters and centimeters. The centimeters is the % at which to print.
Here is a pic of the calculation: