DIN rail wire spool holder

This holder is a practice proven design with useful features for daily work.

Features:

• Stackable: Stack spools with little room inbetween. 
   
• Flexible:  100 and 130mm spools supported (spools with lower diameter too) 
   
• Practical: Change spools while leaving all holders in place.
   
• Structural: Build wire sequences with multiple spools in a few seconds
   
• Easy build: Print two holders, one core and mount them together
   
• Low BOM part count: 2 holders, one core and 2 M3x12 (or longer) counterbore bolts  

Assembly:
Use a bolt to mount the core to one holder. Put your spool in the core. Check holder direction, both clamps shold be on same side. Mount the 2nd holder to the whole assembly. Clamp it to your DIN rail.

Hint: 
Mount spool so the have same winding direction, easier to work with.  

Tested and used by myself