These collets are really affordable.
14pcs-ER32-Chuck-Collet: https://ban.ggood.vip/Xgij (code: BG398115, 20% OFF)
19pcs-ER32-2-20mm-Spring-Collet: https://ban.ggood.vip/Xgii (code: BG7K60GU, US$54.99)
Banggood Clearance Sale: https://ban.ggood.vip/Xgih
You only need a metric set really as each collet has a 1mm range.
TWO TREES Printer:http://bit.ly/36lKfdG
Power hacksaw: http://myfordboy.blogspot.co.uk/p/compact-power-hacksaw.html
Thingiverse STL file for rack: https://www.thingiverse.com/thing:3161059
