STL Scale Converter
for 3D Printed Miniatures

Most people in the hobby treat Games Workshop miniatures as 32mm heroic scale, measured from eye level at roughly 160cm. To convert from true 28mm, scale your STL to 114.3% in your slicer. Your mileage may vary depending on the sculpt.

Multiply your 28mm STL file by 114.3% to get what most players call heroic 32mm scale. This accounts for the 175cm human baseline and eye-level measurement I use on STLACCESS. If your group uses something different, adjust accordingly.

PLA and PETG shrink about 0.2-0.5% during cooling. This is small enough that I do not add compensation. If you want maximum accuracy, print a test piece first and measure with calipers.

28mm true scale measures a 175cm human from eye level. 32mm heroic scale uses the same baseline but adds exaggerated proportions for detail and durability. A 32mm miniature ends up roughly 14% taller than its 28mm equivalent.

Games Workshop uses 32mm heroic for Warhammer 40k. A lot of D&D and Pathfinder miniatures are closer to 28mm true scale, though it varies by manufacturer.

Import the STL into your slicer (Chitubox, Lychee, PrusaSlicer, or Cura). Select the model, open the scale tool, and enter the percentage from stlscale. Lock the X, Y, and Z axes to uniform scaling. Apply the change and slice as normal.

1:56 is a ratio scale common in historical wargaming, including Bolt Action. It works out to roughly 28mm true scale when you use a 175cm human baseline. To convert 1:56 STLs to 32mm heroic, most people scale them to 114.3%.