Printrbot Simple Metal Bowden Conversion

After 4 years of enjoying my Printrbot Simple Metal (with lots of upgrades), I have decided to switch out the direct drive extruder and convert to a Bowden extruder, but I still wanted to reuse as many of the original Printrbot parts as possible.

My first problem was the Hotend mount. Starting with the design work of Tech2C for a E3D Hotend, I made the modifications to fit the Ubis Hotend. Mounting holes are sized to accept M3 screws, and the Bowden hole is sized for an M6 fitting. (This mount is for the Ubis brand of hotends, available through Printrbot.)

I designed a simple platform based on the design "Printrbot Simple Spool Holder/Handle" by in-the-garage for the Bowden extruder to mount on, the platform sits on the top of the Z-Rods.

The Bowden extruder is a modified version of the "Compact Bowden Extruder" by Schlotzz. Using his SCAD file, I was able to make the changes to reflect the Hobbed Gear that came with my Printerbot Simple Metal Printer. By using this Hobbe