This is just a little preview of my new project. It’s not finished yet, and there are still a few things to clean up on the STL files, but there is enough done that you can see the general idea. This is a belted flexible fillament extruder, which uses the Bondtech 2.0 extruder core dual hobbed wheel kit as it’s core (http://shop.bondtech.se/ec/kits/bondtech-extruder-v2-30-mechanical-kit.html) .
Some theoretical improvements:
- Double the extrusion force on flexible filliment before stripping will allow for faster printing
- A belt drive system is more compact, but delivers about the same amount of torgue as the greg / wade style gear system, but with zero backlash.
- The motor may be turned and tucked in closer to the main extruder body, so the lower filliment path may be shorter by 5mm, which should improve extrusion speed and quality
- The dual hobbed wheels eliminate one of the wear points of the PTFE tube. The steel inlet cap will eliminate most of the rest, which means this extruder may be suitable for ABS and PLA
The larger diameter hobbed wheels allow greater surface area contact with the filliment even without the second wheel
- Cleaning ports on both side, as well as a removable side pod to access the middle.
- Theoretically approximatly the same weight as the stock flexystruder since the belt system weighs less than the gear setup, the unit is shorter, and the tensioner for the belt system only adds back a few grams over the weight of the normal motor mount.
- It’s about 10mm thicker than the stock flexystruder, which will require a different carriage. This is due primarily to the height of the hobbed wheels.
- Component cost is higher by $60.
I have the parts now, I just need to finish the design work and print it to test it out. Then I need to figure out what I want to do with it.