Modular Filament Rack

wanted a standalone filament rack that was easily expandable and that took a small surface area to print so that I could maximize the number of pieces that I printed at once. The result is a rack that uses ½in PVC for both the vertical and horizontal bars. The rack can be built with as many layers as you want. Using just the top/bottom pieces will get you 2 layers, but the middle pieces can get you as many additional layers as you want. The end pieces do not have holes that go all the way through for the horizontal bars, but there are also pieces that do have through holes in the event that the horizontal bars are too long and you want extra support. These are labeled as the center pieces. I have added 5mm holes at all the connection points so that holes can be drilled and M5 bolts can be used to hold everything together, however I don't think that it is necessary since the PVC fits tightly. The 5mm holes for the horizontal bars are inside the holes for the vertical bars (this keep