This is just brilliant! In their own words:

Don’t discard old rotary blades, use them in the BladeSaver Thread Cutter! Product Features: Give your used 45mm rotary blades extended life by using them in the BladeSaver Thread Cutter and make cutting your chain pieced fabric projects fast and easy.

Each BladeSaver comes with a magnetic case to keep your thread cutter safe when not in use or when taking it to class. The BladeSaver case doubles as the blade stand to hold your thread cutter securely in place during use.
Purchase includes:
-3D printed BladeSaver case with magnets installed
-3D Printed parts for the BladeSaver blade cover
-Nut/bolt needed to assemble the 45mm rotary blade into the blade cover (please note, color of hardware will vary between silver, gold and black based upon availability).
-Printed assembly instructions

Now there are a total of six color options:

Depending on the color, these are expected to arrive this month and next so place your orders now!