Two-to-five steel sheets holder with optional nozzle storage

First, thanks to download, ❤, post makes, give feedback, request variations, etc.  The model is parametric so I can easily upload an STL for 6 or more steel sheets.

This remix is a product of me 1)having more than 3 steel sheets, and 2) having a drawerful of nozzles to organize (I own a Prusa XL as well as the Mk4S).

There's a lot going on here:  

• Unlike the original design, this holder consists of several pieces, with the advantage of not dealing with warpage, having flexibility for colors, and modularity – add a steel sheet to your collection without reprinting all the parts.  Disadvantage is need for M3 heat inserts.  Assembly requires M3-8 socket head screws (6 without the nozzle holder, 6mm or 10mm screws will probably work).
• The nozzle holder is optional
• I uploaded variations to hold 2-5 steel sheets, but the design supports as many as you like.  Message me if you want a holder for >5 sheets.
• The steel sheet holder can be mounted on the Original Prusa Enclosure, or used stand-alone.  Stand-alone version add a support foot to the back of each column.

Choosing your parts – The steel sheet holder consists of a backplane, two columns, and the optional nozzle holder.  

• The numbers 2-5 in the file names indicates the number of steel sheets for your holder
• Backplane:  Regardless of options, you can always use backplane_NH.stl.  backplane_NH_SA.stl loses the heat insert holes to mount to the enclosure.  The NONH versions add the attractive honeycomb pattern, no mechanical benefit afaik.  To save filament, you can use a #3 backplane with #5 columns.
• Columns: SA version adds a back foot and omits the heat insert holes.  NONH version omits the through hole to attach the nozzle holder to the front.  
• Nozzle holder:  There's a QR version and NO_QR version.  If you have multicolor capability, the QR version should be your choice.

Printing notes:

• Parts are already in print orientation.
• Most parts need heat inserts.  A properly installed heat insert needs higher filament density in that area.  Rather than print your entire model with 4 walls, you should use the infill modifiers to adjust the infill to 100% density in that area only.  Import simultaneously with the part, then adjust settings.
• For the nozzle holder with QR code, you will simultaneously import the nozzle holder, the QR code, and the infill modifier.  Assign colors to the nozzle holder and QR code, and adjust the settings for the infill modifier.