More details on cutting the bands and connecting the cans...

I made some supports and stops to help position the can in the most favorable locations. The "C" shaped stops under the Dremel allowed for a smooth surface along that cut side and the blocks on either side provided lateral support. The can is supported vertically so it is just within the range of the cutting wheel. I added a piece of coarse sandpaper to fine-tune that vertical support plus the bar code on the paper served as a visual guide while turning the can. The wide and narrow bands already cut are visible. I used a sanding disk to de-burr those bands prior to use.

The support for the joining operation is shown here. Shown is the end result of joining 4 pairs of cans (bottom-to-bottom) with narrow bands. On the left the circular disk is the detachable stop to help insure the can is inserted to the mid-point of the band. The bands were put into the oven at 400-degrees F. The bottoms of the cans had been sanded off and "PAM" was smeared along the area where the band was to be located. The cans were then put into the freezer. I would pull out a band and slip it over the round stopper, then take the cold can and place it on the support. Using the wood block and hammer I tapped the can into the band. This process of joining one can to one band may have taken 30 seconds.

I put the can/band combo back into the oven and waited a couple minutes for them to heat up. With the round stopper removed I pulled out the hot can/band and then the cold can was positioned to go into the other side of the band and tapped. The end result would be one of the four pairs as seen in the photo. Again this took perhaps 2 minutes for all 4 pairs to be completed. Besides working extremely well, the only issue was the tendency to "tap" too hard, somewhat compressing the can in an unfavorable way. The 8 cans, when lined up as four connected pairs are exactly the same length as the 8 cans when positioned tightly end-to-end.

Although tempted, I will not test the final 8-can-pipe to see if it is watertight, but by selecting cans without the dimples, and insuring the cans were inserted to the midpoint of the bands, I'm sure these will be water-tight. Next operation will be to grind out the tops of these cans so I can then repeat this process with the three wide bands and therefore complete the 8-can-long pipe.