These are some parts that can be printed to adapt a Craftbot for a E3d hotend. The design has gone through many iterations to get to this point
I have not yet extensively tested the design but so far it is showing promise. This is why I have marked it as a work in progress.
The three printed parts are:
A spacer/bracket which holds the hotend in place and moves its position away from the carriage.
A filament guide (roughly based on Scott Booker's flexible filament guide). This allows the use of flexible filament but its main purpose it to hold the PTFE tube that runs into the heatsink. This version has a hole for the tube up so far and then is just big enough for the filament the rest of the way.
The mod requires three printed parts, an E3d v6 hotend, 6 x m3x15 bolts and two M3 Nylon nuts. Like all good Engineers that dismantle things and put them back together again, there are spares left over (a couple of bits no longer needed.
Print the parts in ABS with a lot of infill. You should not need to drill any parts out or file any parts down.
When installing, I used the stock heater cartridge but swapped out the thermistor for the E3d one as the hole in the heater block is too small for the stock one. I would advise drilling out the heater block a small amount and using the stock thermistor as there is currently no way of changing the firmware for the new thermistor.
The lever that moves the filament drive bearing will no longer work after this mod (I have not needed it anyway) but it will need to be put back in to position floating to add tension.
The easiest way to assemble it is as follows:
After dismantling the extruder:
Put the Nylon Nuts into the spaces provided in the hotend attachment.
Clip the E3d hotend into the hotend attachment, with the ptfe tube already in place.
Match the hotend attachment up to the L bracket with the ptfe tube poking through and push down the filament guide into place. (The ptfe tube will need to be cut to length, I calculated it to need to be 44mm long but it is worth confirming this for yourself).
Bolt it all to the motor, bottom left bolt first (through the filament guide) and then bottom right).
Re-install the drive gear.
Re-install the top part (leaving the bolts not completely torqued up)
Put the lever in place and re-install the spring.
Take the front fan off of the fan assembly (dangling) and re-install the fan assembly while holding the hotend attachment in place. The bolts should go through the Nylon nuts (already installed) but they will not raise it, they will just hold the front in place stopping any canter-lever motion on the hotend.
Re-install the front fan.
Install the Z axis stop tab
Please use E3d's installation instructions along with this.
Hopefully it is an easy enough mod to work out how to put it together from these points but if anyone has any questions, feel free to ask.
Please note that these instructions and files are offered in good faith and while they worked on our Craftbot, we cannot guarantee that they will work on yours and accept no liability whatsoever for any damages caused by following these steps.