Scuba Tank Roll Control

These are used to keep your tanks from rolling around while transporting them.
Very basic to print. Use a type of filament that can withstand being outside and in the sun.
PETG has been my choice.
I use 5 Shells to make it strong. The scuba tanks are heavy.
Print works well with the 'side' on the bed.
You can use Paracord or other string/rope to put them together.
You can also use 1/2 inch schedule 40 PVC pipe for a more rigid fit.

The diameter was matched to a 100lb Steel USA type scuba diving tank. I am sure it is close enough for most tanks.
I have included the Fusion 360 File so you can change the design as you see fit.
I used Type III Parachute Cord - 550 Cord 7 Strand found on Amazon to link some together. Bit of a tight fit in the holes. But that makes the knots catch easy.

The DIN Valve protectors can be found here: https://www.thingiverse.com/thing:5452545