geeetech prusa i3 pro b spool holder

I didn't find any reliable spool holder so I design my own :)
I'm testing it and it's look like the spool holder works great.
It's for 8 mm acrylic frame.

For spool:
Spool Diameter 20.00 cm (7.87 In)
Spool Depth 7.20 cm (2.83 In)
Hub Diameter 10.20 cm (4.02 In)
Hub Hole Diameter 5.10 cm (2.01 In)