These O scale Bell End Concrete Pipe models were created from data from the Oldcastle website – the pdf linked (link to pdf) is complete with drawings and all dimensions from 15″ to 60″ pipe (Note: the pipe diameter is the ID of the pipe – the large OD varies).
As I said, the size refers to the ID of the pipe. The other dimensions are scaled from the drawings and dimensions in the PDF linked above. I have created four sizes in O scale – 15″, 18″, 24″ and 30″ – All of these are a scale 8′ in length:
The model is printed in PLA. Polylactide (PLA) is a thermoplastic polyester and will biodegrade over time if the raw plastic is exposed to UV light. For modelers .. prime, paint .. and you are good to go.