Extruder Belt Reduction

Extruder Belt Reduction

An Extruder with bowden cable has a much greater push resistance than a directly driven extruder.
When a small nozzle is used, the resistance becomes even greater, so that we come to a point where the stepper motor is no longer able to drive the filament wire.
A belt driven reduction can offer the solution.
The Belt drive has been recovered from a RC plane 2: 1 reduction.
The big wheel is 36mm and the small wheel is 16mm outside diameter.

After making the reduction housing, it appeared that the belt was being rubbed against the middle mounting bolts.
That is why I made a second part, namely the bearing block, this to push the belt a bit away from the bolts.
See assembled drawing, red is bad, green is good
This bearing block can be placed in the reduction house, or you can use the integrated bearing block.

Bill of material:
Big bearing in the reduction house : outside diameter 19mm inside diameter 6 mm height 6mm
Bearing on the extruder : outsi