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

Last crawled date: 4 years, 2 months ago

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 ;)