3/4 PVC holders for Filament holder

I like the 3/4 PVC pipe for a spool holder, but i want to get this down a bit, so i remixed this one to have some mounting holes, and i will mount 2 of these to some plywood so that i can have a shorter filament holder.

Edit: I ended up using a extra shelf i got from Ikea's spare parts bin for $1.