ZIP comment
archive comment cleared
_rels/.rels
non-standard relationship removed
3dmodel.model
embedded identifiers normalised
Creation and modification dates
timestamp fields cleared
slice_info.config
client header fields removed
project_settings.config
embedded date references cleared
model_settings.config
internal path references cleared
Vertex coordinates
coordinates standardised to 4dp
Application metadata
software version field cleared
PNG thumbnails
non-image chunks stripped