Ender3 direct titan extruder mounting bracket

Description

This design is based on the angled titan extruder bracket designed by napfkuchen. I remade it in Fusion360 as a learning exercise for myself, and have included the file so others can make their own changes easily. There are a few changes from the original design as follows: 1. Significantly more rigid design 2. Some dimensions changed to accommodate the extruder design i bought. 3. Designed to be compatible with the petsfang bullseye cooler ([link](https://www.thingiverse.com/thing:2759439)) when using the original ender3 fans and original hotend. I'm unsure about compatibility with the original fan shroud, or with the microswiss hotend. 4. Rear hole (between the two wheel axles) was enlarged to cover the threaded insert that exists on the ender3. This was too small on the original design. The rigidity of this design is greatly improved. The original design required a linear advance (marlin) / pressure advance (klipper) of 0.8 because the extruder was able to flex up and down. Adding the new support (the one that holds the locknut) underneath the motor brought the linear advance down to 0.3, and flexing is no longer visible in the bracket. This design reuses the original extruder stepper motor, however a lighter motor could be substituted. The titan extruder I bought was a clone from china, and may have different dimensions from the original. But it shouldn't be too hard to modify the dimensions to suit. As far as printer quality goes, this has made a massive positive difference for very little cost (I think I paid ~$8 AUD for the extruder, and reused everything else).

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