Low cost filament spool

This spool of thread I use for storing homemade thread. As the core is used cut the water pipes with a diameter of 50mm with a length of 60 mm. In the middle of the tube made the hole for fixing the beginning of the thread. Side of the coil made of corrugated cardboard and has a diameter of 200mm, 50mm inner
The coil can be assembled without glue. For compact storage after use coil disassembled. The size of the flanges is calculated for the FilaWinder from ianjohnson. http://www.thingiverse.com/thing:174383
The coil removed about 1 kg filament diameter of 1.75 mm
Below is a video of the work of winder.