Combo extruder

Extruder for 2 in 1 hotend, where one side is direct extruder and other is bowden extruder, so you can use soft filament and keep the weight of the carriage down. I printed it on belt 3d printer without any support, you may need support on standard printer. It utilise the M4 extruder dual drive gears which could be obtained from Aliexpress. Make sure you shape the teflon tube to the dual drive to get the best direct path for soft filament. The ratio for the drive is 3:1 on belt drive or slightly higher on the gear drive. I also uploaded .step file for the GT2-60 pulley which you can modify to different pulley pattern, just for fun to see what pattern you guys will come up with.