It is pretty stable but needs suports on the slots and long bridges. You can try printing without supports on the bridges but it tends to make some strings and makes the walls on the side come together.
I include an obj file for easier customization.
1 of this can hold up to 3 1kg 66mm wide spools
There is a botom part witch stands on the ground/table/etc.
The middle part can be placed on the botom part and the middle part.
The top part can be paced only on the botom part or the middle part, i've made it to have a no mountings on top to look better and for the flat surface.
Edit: i have added stl files for it, an added a top cover model to use it also as a shelf
If yousefool please leave a comment with a photo ;-)
The author marked this model as their own original creation.