I'm still running Techzone's wooden extruder, but have long since replaced the hot end with
MakerGear's.
I did have to modify the TechZone assembly quite a bit in order to make it compatible with MakerGear - if you have the option of printing a new extruder,
Greg's Wade should be more compatible.
Also, I understand that
CdnReprap sells a well constructed hot end.