I have been working on a Bowden IDEX design for a few weeks and am ready to let is loose into the wild. I was never fully happy with the Direct IDEX design due to the loss of build volume and the lack of a dump zone. This new design is fully compatible with all versions of BigBox. There is a minimal loss in X of around 25mm, but you still retain the use of the dumpzone. There is also no need to modify the frame. The files are available from thingiverse | https://www.thingiverse.com/thing:2073946 I have included the S3D .FFF File, a precomfiled RC8 .HEX, a control script for OctoPrint to add filament load / unload functions and of course all the .STL files correctly orientated and chamfered for best printings. Requirements (additional). 2 x NEMA 11 Stepper Motors. (You'll need an extra 1700mm Cable. I have a few in stock, if you are building this upgrade and purchase parts from E3D add a note to the order that you would like a motor cable). 2 x LM8LUU Bearings. 2 x F604ZZ Bearings. 8 x M2.5 8mm Socket Cap Screw. 2 x 20mm M4 Grub Screws. 2 x 8mm M4 Grub Screws. 4 x 45mm M3 Socket Cap Screws. 2 x 16T GT2 Pulleys 20 x GT2 belt (2 Meters). 10 x PTFE Tube (1 Meter). 2 x 460mm 8mm Ground & Hardened Shafts (cut down original BigBox 484mm Rods). 1 x Endstop (those are not the correct ones but if you put a note in the order that it is for a BigBox we will make sure you get the correct endstop). 1 x Blow Fan (If you mention it is for the BigBox and ask that they speak to me I'll make sure you get the fan). 1 x Stepper Driver (These are the same A4988 Drivers but in a different design). If you are upgrading from a Pro BigBox you'll also need a Hotend and PT100 Amplifier board and matching cable (ask for the cable when you order)! When printing the parts you'll also need this | https://www.thingiverse.com/thing:1531536 and an extra X-Carriage belt tensioner. I would also recommend this too | https://www.thingiverse.com/thing:1755929 I am sure there are a few minor things I have overlooked. I will update as required. ASSEMBLY NOTES Do not refit the rubber o'rings into the X-Carriages, they are not required. Any offset in Z in managed via the M218 command.