(way too little pulling force),
I'm in the early stages of designing my own extruder.
Design-intent:
- geared down stepper motor
- spring-loaded lever to adjust the pressure
- mount for a rotary-encoder that meassures the filament being actually pulled in
- integrated compartment for a sponge to clean the filament
- use herringbone-gears
- mounting holes for a fan for the stepper motor
- low center of gravity (reduced stress in transport and backlash)
- allow ToM and RepMan hot-ende and allow both extruder mounts (I want to design this only once for both my printers)
- 3 point mouting (use 3 contact points to mount the extruder to a Thing-O-Matic z-stage as opposed to the flawed arc-like 2-point design of the default MK6-steptruder. Doesn't matter on a Repman.)
Originally I wanted to use 2 drive-grears to grip and pull the filament from both sides instead of clamping it between a drive-gear and a 608-bearing but I found that this would require a more complicated gear because the only stationary point on the lever is it's axis and that is not the axis of the intended second drive gear.
So that would require 2 more gears in a very small space.
Don't hold your breath. This will take me a while to get right but I'm working on it.
- post in BfB forum
- post in Makerbot group
- post in RepRap forum
- Design files on Thingiverse (coming soon)
- Photos (coming soon)
- Video (coming soon)
- All Videos (please subscribe)
2 Kommentare:
looks like greg's accessable wade's v3. any significant differences between your design and his?
Where to find it?
Do you mean this one?
http://www.thingiverse.com/thing:8252
What about:
* no encoder to detect failures (a MAJOR point for me to get unattended prints of dozens of parts in a row)
* no mount for BfB and Makerbot hot-ends (I require both)
* no herringbone-gears
* thicker axis on the lever
* lower center of gravity
* no sponge for dust-removal
* no fan mounting
* he does not define the BitsFromBytes hotend-mounting that I require to mount this to the RepMan 3.1
* He does not define what toolhead-mounting it has. It surely does not have RepMan and ThingOMatic at the same tine.
I guess it mounts to a RepRap of Mendel or Huxles. Certainly not a MiniMendel. Maybe a Darwin.
The photo shows it printed on a Mendel but that does not have anything to say about what printer it is intended for.
* He uses SCAD (BETA, not a single stable release, certainly not finished) while I'm using a CAD program and plan to export it to a range of industry standard file formats that can be used in assemblies of other CAD designs.
I like the open design with the accessible drive-bolt axis.
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