QU-BD Two-Up Replacement Part QQ 12-HTD3-05 Aluminum Pulley

My QU-BD Two-Up printer came without these two important X / Y axis timing pulleys. These are part QQ - 12-HTD3-05.
So I figured a temporary replacement could be made while I wait 3 weeks for them to ship me the original bits.
This was made from droftart's excellent timing gear generator SCAD file, here http://www.thingiverse.com/thing:16627
My modifications to the SCAD file include adding a key to lock it to the spindle shaft. My first upload of this file used bolts to lock it against th