BETTER METRIC UPGRADE for about $40

[samirabaza]

BETTER METRIC UPGRADE FOR PRINTRBOT SIMPLE METAL:
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the one and only Tr8x8 p2 TAPPING TOOL on the planet online store to tap your Printrbot simple metal derlin nut to fit Tr8x8 400mm stepper motor
you need to enlarge the hole size using 1/4" drill bit first
NOTE:you will also need to enlarge the z motor axis hole in the printer body from 6mm to 8.5mm or 9.5mm to allow the Tr8 threaded bar

links:
ROBOTDIGG
tap:(choose TrTap-Tr88)
http://www.robotdigg.com/product/794/Tr ... -Tr8*8-Tap
stepper motor:
ORIGINAL Z=150mm
ROBOTDIGG (not the one I use)
http://www.robotdigg.com/product/8/Thre ... -Leadscrew
UPGRADED Z=250mm
ROBOTDIGG (not the one I use)
http://www.robotdigg.com/product/31/NEM ... -Leadscrew

ebay:(I am using this one)
http://www.ebay.com/itm/262430479616?_t ... EBIDX%3AIT

then all what you have to do is to send the following codes to your printrboard
ORIGINAL Z=150mm
M92 Z400
M500

UPGRADED Z=250mm
M92 Z400
M211 Z250
M500

HAPPY MODDING FOLKS