This is my version of a Filamentspoolholder. The only thing you need are tubes with 20mm thickness. I use metal tubes for elctric cables. PVC tubes will also fit, but you need more traverses for more strengh.

Just mesure the diameter of your tubes and download the modell that fits for you. I added three versions with different diameter of the holes: 19.5mm, 20mm and 20,5mm. If you need a different size, please contact me, and i can adapt it for your size.

I printed it in PTEG with 15% Infill and 3 Walls. 

I think PLA will work to. Perhaps you can make 5 walls to be sure.