ChowThink Armour 3.5 Ender 3 BMG Mount
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This is a direct drive BMG extruder mount for the ChowThink Armour 3.5 on an Ender 3/Ender 3 Pro.
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So I got one of these ChowThink Armour 3.5 total hotend replacements for an old Ender 3 Pro I have at my job. Its actually not a bad upgrade for an all in one type of thing and pretty cheap too, $24 USD on amazon at the time of writing this.
But I wanted to make it direct drive and from what I could find nobody else had made a mount yet to do that specifically for this hotend kit. Some of the generic ones might have worked but the ones I found had the stepper motor facing sideways or backwards. I specifically wanted the stepper motor facing forwards cause I wanted to use an extruder spinner and I like spinny things lol.
So I took it upon myself to roll my own mount. I used Tinkercad and I apologize if its rudimentary but damn if it doesn't work well. I originally designed it without the extra bracing going over the X carriage but then there was nothing from stopping the whole hotend from bending up or down and it easily bent with all the weight on it. The bracing solved that issue.
It's designed to use a BMG clone extruder and a pancake stepper motor. This is the one I used:
I would print this in PLA instead of PETG. The PETG version worked in my testing but was too easy to flex for my liking, the PLA version was more rigid. I ended up using PA-CF since I had some and is lighter than PLA or PETG but PLA will definitely still work. I printed it with 3 walls, 20% infill, supports on critical regions only.
I recommend printing it in the orientation that it is when you import it to your slicer, however I did design it so i could be printed laying down on the angled flat part on the back. It seemed to be more rigid printing it standing up so I settled on that.
It requires 4x screws that go in the top of the ChowThink heatsink. I am not sure exactly what size they are, but I was able to find 4x matching screws in my spare ender parts box. If anybody really needs to know put it in the comments and I will take one of the screws out and measure it. To mount the BMG to the stepper motor I just used the screws that came with the BMG clone.
Maybe someone else will find this useful, maybe not. But its been working quite well here for me and between the hotend and direct drive conversion has massively improved this old ender 3's capabilities.