Spoolholder for Mendel / Prusa

I want a Spoolholder which can be fixed without screws,waschers, etc. and fits on the Top of my Prusa. So I created a holder with 3 Parts.


This holder is for a little Spool (the 750 gr.) I think the big one looks to big, so I'll change fillament from the big Spool to the little one.