Voron afterburner mount for Ender 3 (bmg direct drive)

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This design is avaible under GPL v3.0 (not GPL v2.0 as thiniverse states). This is for compatibility with licenses of both ender 3 and voron afterburner.

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Hi. This is another mount for voron afterburner to ender 3. Compared to other mounts, it reduces the Y range the least and is most rigid (as of September 2020). There is a price to pay, and that is a change to the afterburner design: a new motor plate.

It is compatible with afterburner as of commit 731dceba If afterburber design changes, it may need an adaptation so watch out.

The designs for ender 3, ender 3 pro and ender 3 v2 are different, because they have slightly different X carriage plates. I have only tested the pro version because this is what I have. If you test other versions, let me know if they fit well.

You need a slim nema17 motor, otherwise it may hit Ender's z profiles. By reports in Voron discord, 23mm fits fine. (The spec motor for afterburner is 20mm.)

BOM is everything you need for an afterburner plus m3 screws and m3 heat inserts (see picture). For cable management I used a cable tie, it seems to work fine.

I did not make a mount for bed leveling sensor: I don't use it, and frankly do not feel it is needed on my Ender 3: the bed is sufficiently flat and stable. And there is the manual mesh bed leveling.

Endstop offset is (-15, -15). If you use Marlin, you could set in Configuration.h:

#define X_MIN_POS -15
#define Y_MIN_POS -15

Print with ABS or with any rigid plastic which works in your temperature range. Take into account that the mount contacts the stepper motor which may get hot.

UPDATE: I include a motor plate for ender 3 v2. I do not have ender 3 v2 to test if it fits. If
you test it, I would appreciate if you let me know.

UPDATE: A version for non-pro ender 3 added. I did my design for the pro, thinking that there is no difference between pro and non-pro. It seems I was wrong.

CAUTION: This design reduces the Y range of Ender 3. Less than other mounts, yet still, the rear ≈10mm will be inaccessible. This can be solved by moving the bed profile forward, but this is not immediately easy.

Designed in FreeCAD, and I include my source files. WARNING: FreeCAD complains that Voron's step files, on which I based my design, are invalid. This may lead to recomputation errors. For this reason I include a simple copy of the motor plate and a step file. (Both are, technically, invalid, inheriting problems of the original step files. With care they can still be used.)

This mount is released under GPL v3.0, https://www.gnu.org/licenses/gpl-3.0.en.html