Mods for Remote Direct Extruder with Bondtech Gears (30:1 Gear Ratio)

First off, If you don't know what you are doing then don't do this mod. This is a remix of https://www.thingiverse.com/thing:4009262 with changes I made to make things work well with my setup. I will only include parts that I have changed/added.

First off, go read everything from https://www.thingiverse.com/thing:4009262 and plan what you want to do.

Changes

• Some parts did not fit tight, so i redid them.
• Some parts were made smaller/lighter.
• Some parts were made more chunky.
• And some extra stuff to bring it all together.
• Also print it in black!

Details

• Moved the extruder motor to the left of the printer next to all the other motors and changed how it is mounted (now mounted from the bottom
• Added a knob for the front screw (super glue this)
• Screw washer now fits my screws
• The good quality fake bond tech I used came with slightly smaller bearings so added an outer ring to make it fit the housing
• Cover for the worm drive shaft made the screw not reach so modified it so it reaches
• Cover got the motor side made more chunky for added strength
• Motor shaft cover made taller to match the overall height of the original with different mounting system
• Flex shaft Mount Ring (x2) to guide flex shaft around the printer.
• Flex shaft Mount Top mount for top of printer
• Flex shaft Mount Side mount for side of printer

Firmware

I am using a SKR mini 1.3 with TMC2209 with Marlin 2 branch bugfix-2.0.x.
My esteps were different to the original. Also my linear advanced needed retuning.

```
#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 1026.56 }

#if AXIS_IS_TMC(E0)
#define E0_CURRENT 400
#define E0_MICROSTEPS 4
#define E0_RSENSE 0.11
#define E0_CHAIN_POS -1
#endif
```

Tips

• Print parts strong where possible, I mostly used 4 perimeters and 12% gyroid infill.
• When doing test prints and calculating esteps turn off linear advance. Once this is all good, redo linear advance, I found my numbers to be very different to the stock extruder.
• Always print printer parts in black ;)

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