Third attempt however was looking promising:
And so when it checked out I decided to practice the glue on this piece before doing any more:
This was glued up and you can see how transparent the end result should be - bubbles are definitely bad! Always remember to tape up your lockrings before glueing the end caps on though. Finished:
Woohoo - all of that for one bent piece of tube! One thing I realized though was that section of tube was not quite horizontal. While the Monsoon measuring devices make measuring easy you want to check that any horizontal sections are actually horizontal as even with perfect 90 degree bends you can end up being off. First I took the spirit level:
And then shored up the south end of the board with paper until the memory block was horizontal:
Good enough! Now let's check that section of tube we already did:
Yikes! Not really good enough - however after doing three of the same I decided to move on and possibly replace this one later!
Moving on to the next section I discovered that it was already too short a link to use the mandrels in the way I already had. I could set them up so as to do each bend individually without firmly fixing the other bend. This felt against the whole point of the mandrel kit which was to get perfect repeatable bends. The real problem was that the extra material around the mandrels which ensured good straight lines after the bend also stopped the next mandrel from getting close. My solution was to chop the 180 degree mandrel in half - I now had a 90 degree mandrel with zero straight edge meaning I could now do much tighter u bends than the two individual mandrels would allow.
You can see my cutting was a bit jagged because I was cutting from the far side with a jigsaw which are notorious for not cutting straight. Still it was good enough for my purposes:
That was the setup for the 2nd bend, and this was the one for the third bend with the tube post bend:
Now the last shot of the day with those two extra pieces in place double checking alignment. I'm a little nervous that the final piece may rub against the other tube coming out of the cpu block, It looks but I may add in a third bend on that section just to kink it over. That's it for now!