Compact Bowden Extruder, direct drive 1.75mm
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About this print
A compact direct drive extruder body designed for 1.75mm filament and an MK8-style hobbed pulley. It is used as a cold-end component on a range of FDM 3D printers, including Anet A8, Prusa, Kossel, and Rostock delta machines. The design allows the extruder to be mounted directly on the carriage or used in a bowden configuration. PETG is a good material choice, as it combines reasonable stiffness with enough toughness to withstand the mechanical stress of filament feeding.
From the original design page
Original maker's notes
By schlotzz on Thingiverse · CC-BY-SA
A compact direct drive bowden extruder for 1.75mm and a MK8 style hobbed pulley. The OpenScad is almost completely parametrizable, so it can be adjusted to fit other hobbed pulleys as well. The mounting plate can be removed from OpenScad easily.
I have used a 13x8mm, 5mm bore brass hobbed pulley, because it was easy to acquire here in Germany.
The used MK8 style hobbed pulley can be ordered at the following websites:
- https://www.reprapsource.com/en/show/6889
- http://reprapteile.de/mechanisch/direct-drive-geraendelter-pulley-drive-gear.html
*Note:* I ordered a suitable compression spring later, so it's not visible on all of the images.
**UPDATE 2015-10-13:** Designed alternative idler to solve breaking of bearing support
**UPDATE 2015-03-17:** Updated idler for better MK7 drive gear support
**UPDATE 2014-11-13:** Added push-fit bowden inlet option
**UPDATE 2014-09-22:** Fixed OpenScad file due to non-manifold vertexes between base and filament tunnel after inspection with MeshLab, exported STL
**UPDATE 2014-06-01:** Removed the work-in-progress flag after extensive testing and positive feedback from the community.
**UPDATE 2014-04-27:** Placed base and idler "printer ready" beneath each other, added compact_direct_drive_extruder.stl with base and idler combined
**UPDATE 2014-04-07:** Replaced tensioner hole with slot on idler, added funnel on bowden side of base for easier filament insertion
Formatting may have been simplified. These are the independent maker's instructions and fitment claims; Hark Tech has not independently verified them.
Printing Compact Bowden Extruder, direct drive 1.75mm
For Compact Bowden Extruder, direct drive 1.75mm we would normally reach for PLA — it is the easy, economical default and suits the majority of models. We set the layer height, wall count, infill and supports to suit the model and how you will use it, and those choices are already priced into your instant quote. Want a specific colour or material? Tell us and we will match it where we can.
Model details
| Downloads at source | 78,253 |
|---|---|
| Likes at source | 5,252 |
| Original model | View on Thingiverse |
| Designer | schlotzz |
| Licence | CC-BY-SA |
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