Download the design as a STEP file. In Onshape, upload it into a document, then right-click the uploaded file's tab → Import… → Import to this document: Onshape stores uploads as plain files until you ask it to translate, so without this step you only see a download card. After the import (a minute or two for a full robot) every part is a separate, named, coloured editable solid; Onshape creates Part Studios and Assemblies as the file's structure needs (or combine into a single Part Studio at import). Fusion, SolidWorks and FreeCAD open the file directly. Structure and gearing carry true dimensions, tooth counts and bores; belts and chains are wrapped loops; motors, gearboxes and electronics are catalog envelopes and their part names say so. Concept geometry to keep engineering, never a frozen mesh, never a claim beyond what was modelled. No account keys, no setup.
The fully parametric source, every dimension a named variable. Copy it into a Feature Studio yourself, or publish straight into your account with Onshape API keys (used once, never stored).
Designs are generated for signed-in accounts. Creating one takes a moment. An email is just your key back in.