Helmet holder I designed for my needs since most holders out there have sharp edges and/or tiny contact space which is bad for helmet styrofoam. I printed it wall side down but I strongly suggest using Cura feature which alternates wall thickness therefore "holds" infill better and makes part more rigid. Also, minimum amount of supports is needed - part is designed for minimum amount of supports and maximum pressure area inside the helmet. Be careful not to overtighten wall screws.