Holders for round rods (on which spools or anything else, can be placed/hanged)

Info:

• These holders contain of left, middle (optional) and right part. 
• The system is adjusted for my solution, where I needed to hang it over my other construction (see photo)
• Middle part is universal (but i did not used it)

Dimensions:

• Rods up to 20mm diameter
• The thing, over which this will hang - 17,5mm max
• works well for 1kg filament spools, but can carry bigger

Model

• inspired by original - https://www.prusaprinters.org/prints/19970-over-the-door-towel-rod-holder where it holds one rod. So here I need 2 rods for spools support.
• I modeled actually this thing from scratch (so it is not a remix in fact), had some problems (i did not know how to reduce amount of edges without loosing a lot of quality), so sorry for huge model :) 
• but result is printable, see 3mf files

Print instructions:

• it fits on Prusa i3 MK3S+ steel sheet quite exactly
• no place for skirt or brim (remove them or model it manually as objects in Slic3r)
• so my print with PETG Prusament had little problems with warping (becuse of missing brim), but the result is still usable
• 20% gyroid infill
• I have used PETG Prusament

Installation:

• for safety:
  • mount these holders to underneath construction with bolts (there are holes on upper sides on left and right parts)
  • rods should be screwed in holders with screws - every part has small holes for fixing the rods
  • since my rods are wooden i needed to fix them together in the middle with wire, this might not be needed with metal rods

Next steps:

• print also https://www.prusaprinters.org/prints/8787-hanging-filament-spool-holder so more filament can be hanged (and actually used when printing)
  • I plan to use it and scale it to my 20mm rods or use remix