E3D Hemera Mount for Ender 3 w/ EZABL

This is mainly a remixed version of the modular Hemera mount from ChipCE on Thingiverse: https://www.thingiverse.com/thing:4017555. If you want to use the other modular options, I would just go directly to his versions. I am simply sharing my adaptation of his. The same instructions and such apply. 

I changed the AIO mount to remove the BLTouch mount and added reinforcements to the mounting of the Hemera extruder itself. I adapted an EZABL mount to attach to the far side of the print head (opposite the fan) since I was using a 20mm thick Noctua and had no more room.

I'm using this duct with the mount: https://www.thingiverse.com/thing:4042492.

OFFSETS:

Home position: 

#define X_MIN_POS -7
#define Y_MIN_POS -16

Okay, so some people change the X and Y minimum positions in the firmware, and these values are from ChipCE's model. In my firmware build, I left the XY minimum positions alone and changed the size of the build volume to (235, 230). I then changed the manual XY home positions. I'm not really sure which is “more correct” but the E3D guide for Marlin 2.0 only changes the home offsets.

#define MANUAL_X_HOME_POS -10
#define MANUAL_Y_HOME_POS -16

EZABL probe: 

I'm using an EZABL Mini with an adapter ring, so the center points should theoretically work on any size.

#define NOZZLE_TO_PROBE_OFFSET { 64, -14, 0 }

A Little Write-up:

I did a lot of research for the mounting options for a Hemera + Ender 3 (Pro) combo. There's hundreds of different options but I did not like the most popular options for a few reasons:

• Many employed a 2-part mounting system that had an anchor on the X carriage and a matching piece on the extruder - and the two would either interlock or screw together. I've seen a couple videos that feature this kind of mount and as an engineer, I really didn't like the decrease in mount rigidity by having some sort of plastic “middleman” that didn't directly mount the Hemera to the carriage. 
  • This includes the mount supplied from E3D at the time. It looks like they have a better version now that is similar in character to this model.
  • I explored the option of purchasing a PrinterMods MDD mounting plate, but unfortunately, despite the flexibility of this product, it still used a 2-part system which defeats the purpose of me buying a $40 additional part.
• Many were also really bulky and pulled the extruder out from the carriage in the Y direction, which adds unnecessary cantilevering of the gantry and sacrifices even more Y-axis build space (the Hemera inherently will eat up about ~5-10mm on an Ender 3 unless you modify the frame).
• I saw a few custom-milled carriages for sale, and I could've machined one myself as well but I didn't want to put in that much effort.
• I wanted to save money since the Hemera itself was already pretty pricey.

This solution from ChipCE was near perfect as it appeared to be:

• Simple and compact, with minimal build volume loss.
• Easily printable and quite robust, since the Hemera mounts directly to the plate which is directly mounted to the carriage. It is functionally efficient.
• Uses stock Ender 3 hardware to mount to the carriage.

I would highly recommend this mount.