Ultimaker filament spool holder

I was pretty happy with the idea to have the filament spool at the back of my ultimaker but had a lot of spools that didn't fit on the original holder. I didn't want to use any other parts so i designed a full plastic printable one for spools with a diameter of down to 30mm.
The holder is sturdy enough to hold 2kg+ and has a tilt of 3° upwards so the spool doesn't slide down.
This is my first design on thingverse so feel free for recommendations.