Inset for Cassette Tape Dispenser

This is a little improvement for the Cassette Tape Dispenser of Ken Mills.

I had the problem that the tape on the hub was sliding out too easily. That's why i designed this little helper, that pushes the hub in. It also makes it look even more like a tape cassette. There is even a little slit where tape can be “threaded in”. The part holds just be friction. 

I recommend printing it on its side with tree support for only the long thin “wing”.
If you want to insert the tape, here is a little hint: It's easier if you put two sticky sides together for a little section, so that it doesn't stick to the part .

There is also the FreeCAD source file and step files included if you like modify the design.
Made with FreeCAD  (realthunder branch).
The model is for the compact (60% size) version. If you want want it for the big original you have to scale it up by 1/0.6 = 1.666.