Extruder Belt Reduction by robberet

Last crawled date: 3 years ago

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 : outside diameter 11mm inside diameter 5mm height 5mm , glued with epoxy on printplate to support the axis of the big wheel the other side of the extruder , see picture
Small bearing block :
F693ZZ 3mmx8mmx4mm Double Shielded Flanged Ball Bearings from BG
Shaft diamter 3mm length : 25mm
F693ZZ 3mmx8mmx4mm Double Shielded Flanged Ball Bearings from BG
MK8 All Metal Remote Extruder For 1.75mm Filament from BG
NEMA 17 26N.cm 0.4A Stepper Motor 42mm Two Phase Hybrid Stepper Motor from BG