off-the-shelf drag chain

* models for openbuilds drag chain gantry wiring
* warriorofwire mods folder
* mods/README.md link to new mod

Mods/README.md

@@ -302,6 +302,12 @@ Also covers the Z-belt hole for improved aesthetics.
 
 - Mount for an ethernet coupler to extend / move the ethernet plug somewhere more convenient. 
 
+## warriorofwire
+
+[Openbuilds Drag Chain](https://github.com/VoronDesign/Voron-2/tree/master/Mods/warriorofwire/openbuilds_drag_chain)
+
+- Collection of models for using an off-the-shelf, cheap, snap opening drag chain for gantry wiring and protecting wires down to the deck.
+
 ## wile.e.coyote  
 
 [Coroplast Support](https://github.com/VoronDesign/Voron-2/tree/master/Mods/wile.e.coyote)

Mods/warriorofwire/openbuilds_drag_chain/README.md

@@ -0,0 +1,29 @@
+# Off The Shelf Drag Chains for 2.1
+Note: Tested with 300mm 2.1 build only.
+
+## Why
+* Drag chains with a snap open side are a joy to work on.
+* It looks awesome.
+* Looming up wires makes them harder to access.
+* I hate tape chains.
+
+## BOM
+* Some M3 screws
+* A few M5 screws that are a couple millimeters longer than the M5's on the gantry.  You'll figure it out.
+* [3x Openbuilds 10x15mm 18mm radius Drag Chains](https://openbuildspartstore.com/drag-chain-cable-carrier/)
+* All these stls
+
+## STLs
+File | Note
+---- | ----
+x_carriage_frame_right_remodeled | Parametrically driven remodel of the right toolhead without the wire tray.  The through-screws are modeled like the original stl, but they seem pretty tight from my printer.  YMMV, you might need a tap or just start working out more.
+x_carriage_dragchain_anchorpoint | You screw your drag chain's floppy end to this side.
+x_carriage_wire_cover | Cosmetic wire wrangler interfacing the drag chain to the X carriage.  Mounts with a short M3 screw.
+xy_drag_chain_bridge | You screw your drag chain's floppy end to this side.  Wires go through it and up into the Y chain.
+a_corner_wire_guide | Covers your wires around the A corner.  Keeps them from chafing against the rail and frame, while keeping them tidily away from the belt.  Also, you screw your drag chain's floppy end to this side.
+lower_drag_chain_mount | Mounts to the rear lower frame.  You'll need to cut an L shaped slot into your bottom panel.  Also a great spot to run your bed and heater wires down through.  Move this on the rail until you get a little tension on your Z chain.  That'll keep it tight and it will look awesome.
+
+## Known Issues
+* I haven't accounted for the toolhead doors yet.
+* X carriage screws are a little tight.  Probably "won't fix."
+* A corner guide could be a little wider in critical places without interfering mechanically with the printer.  All my wires fit, but yours might not.