These are 2 different coil holders that can be used to wind a flat coil.
For the 120mm coil I used 1mm wire and for the 150mm holder I used 0.3mm wire.
flatcoil150mm_bottom.STL | 896.6KB | |
flatcoil150mm_top.STL | 281.3KB | |
flatcoil_holder_120mm.STL | 3.1MB |