We've never found that to be the case.Make sure you have the plastic inserts in the ends. I have read if it is just the pipe, the weight of the roll will deform the core, causing problems printing.
are you asking how to mount one you bought or building your own?
If your building your own i would just grab some 2x6's slot some angled holes and mount them to the wall. Grab some lightweight pipe from your local hardware store and slide your rolls in.
Yeah, the slotted 2 x 6 is a simple plan to execute but I was looking for something more like this:
https://www.youtube.com/watch?v=P5smCOL4mTM
really cool latch system on each end that looks a lot better than a long piece of pipe