Caution

Parametric drawings and tools made in the original design files may not properly translate to your system. You may need to re-design certain components if you are making significant size changes.

Editing the CAD with Free Tools

You do not need a paid CAD suite to remix Sesame’s parts. A few practical workflows:

Fusion 360 personal license – Autodesk offers a free hobbyist tier that can open the native .f3d files. Enable the Design History timeline to see how assemblies were built before changing dimensions.
FreeCAD for STEP tweaks – All parts are exported as .step, so you can import them into FreeCAD, adjust sketches, and re-export STL/STEP files without losing references. Use the Part Design workbench for parametric edits.
Onshape education account – Onshape’s free plan lets you upload the STEP files and edit directly in-browser. Great for Chromebook users or when collaborating in real time.
Meshmixer/Blender for quick mods – If you just need to shave openings or add text, import the STL into Meshmixer or Blender, make the change, and re-export. This is faster for cosmetic tweaks, but stick with the parametric source for anything dimension-critical.

Tip

Keep the original STEP/ Fusion file untouched and branch your edits into a copy. That way you can always rebase onto the upstream design if new hardware revisions ship.