With this rack, you could choose your lenght between 15 and 30 cm. Use the screw and nut to keep top and botton parts tights.
Put grip pads under the feets.
Add binder clips for keeping the threads in place.
PLA
0.2 layer height || .15 for screw and nut
2 or 3 walls
10% infill
Support needed for the middle slot
Brim optional, or add mouse-ears to corners
Print the screw lying flat for sturdiness.
And have fun braiding.
The author marked this model as their own original creation.