While waiting for the bits for my extruder to turn up. I have been tweaking the parts a little. If you look at the fully assembled images in an earlier post, I originally used toothed pulleys that came with the belts at the top of each axis thinking these would be better. The problem was that I could not really tighten the belts as these pulleys simply had too much drag. Although it worked, if things went too fast it would occasionally skip during a move, so I had to slow things down.
That'll learn me fer thinkin.
Wow! what a difference. Now the belts are so tight that I can play a nice base riff and the movement is silky smooth. I was able to increase the movement speed by almost 50% over the older setup and I will get a lot less backlash.
I have included a picture of the top part of the axis. There are two of these flanged bearings on each one. They are only flanged on one side so you place 2 face to face. In the image I have put a couple on top of the printer in this photo so you can see the profile.
Now I am just waiting for the mounting plate for my hot end and the PTFE tubing for the Bowden Extruder.