Filament Variable Speed Spooler Winder

Filament Variable Speed Spooler Winder
Parts:
5mm rod
Empty filament spool any size
625zz roller bearings
To control the speed I use this voltage regulator: http://www.banggood.com/5A-XL4005-DC-DC-Adjustable-Step-Down-Module-Power-Supply-Converter-p-943556.html SKU124701

Motor is a 60rpm version: http://www.banggood.com/12V-DC-Powerful-Torque-Micro-Speed-Reduction-Gear-Box-Motor-p-941191.html SKU154499
I used 1 spring on each side but you can use two if you wish. More the bette