For Instant 3D printing, you can change dimensions (scale) of your part. This option is available for single files only. Unfortunately, we do not support the scaling of multiple models at once. As soon as you add more than one file to your order, you will not be able to change the scale.
You will still have an option to change measurement units.
If you need to change the size of your multiple parts, please edit your 3D files before uploading or ask the vendor to scale them up for the additional cost.