yarn bowl 3d model

3D printable yarn bowl designed specifically for PLA printing. Outer diameter 190 mm, height 120 mm. Wall thickness 11–12 mm for structural strength. Smooth hemispherical interior cavity with 165 mm inner diameter. One large S-shaped spiral yarn slot cut from the top rim downward, with wide opening (minimum 18 mm slot width) and fully rounded edges (6 mm fillet radius) to prevent stress concentration and cracking in PLA. The spiral should not create thin weak sections — maintain at least 10 mm material thickness around the cutout. Two vertical cylindrical through-holes (9 mm diameter) placed beside the spiral slot for knitting needles. Bottom thickness minimum 12 mm for weight and stability. Slight outward bottom flare (5 degree angle) for better bed adhesion and stability. Fully manifold solid mesh, no thin walls, no sharp internal corners, optimized for FDM printing without support. High resolution STL-ready geometry.