I bought and case from esun, it works quite well and protects the filament from dust and moisture, but it does not fit filaments bigger than what they design and sell. I bought a filament from Prima with dimensions: 75mm x 200m diameter and it does not fit inside. That's why I designed and printed one that fits those spools. It is compatible with spools of any diameter and width of up to 78mm. It is very easy to print, no supports needed. It consists on 3 crossbars 2 triangles. Apart from printing the plastic parts, you will need: 6 x M3 screws up to 17mm (no need to be that long!) 8 x Bearings 608ZZ. (Optional) Silicone feet 7.5mm Any PLA or ABS is ok.