Unit and scale converter

Convert between millimetres and inches, work out how big something should be on a scale model, and find the percentage to type into your slicer to print a model at a different scale.

Length units

Model scale

Scale a size

Real size to model Model to real size

Real size Unit

Scale

Rescale a model

From one scale to another

The model is made at

Print it at

Model size optional mm

Any one measurement from the original model, such as its height or length.

Common problems

Print not coming out right? These guides list the likely causes and fixes, easiest first.

Parts the wrong size, holes too small
Parts missing or broken after slicing

All troubleshooting guides