Display shelves from empty filament spools

The idea is to make shelves from empty filament spools.

To make shelf it is needed to cut empty spool into separate parts and then glue two parts together (see photos). To cut spool you can use any saw you prefer but simple hand saw is enough. Just watch your hands.

I've added jig (stl file) to be used to make cut marks easier a bit. The slot in jig can help to find hole to hang shelf on. 

To make shelf bigger you can put any playwood or plastic panel on it and bolt it to shelf itself (e.g. M4 bolts and nuts are ok for that).

One can make long horizontal shelves using a few single shelves with longer panels supported by two separate shelves, To make series of vertical shelves hang just one on the wall then attach more shelves by M4 bolts and washers and nuts which is easy using existing holes.

I've also added kind of small drawers to put into shelves if anyone wish them.