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 better I say :)
0.018" Wire Dia 0.24" OD 0.5" Long Tension Coil Extension Spring Hook
http://www.ebay.com.au/itm/301736143103?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT