Compact Bowden Extruder, direct drive 1.75mm

Name: Compact Bowden Extruder, direct drive 1.75mm (3D printed)
Brand: Hark Tech
Price: 6.90 GBP
Availability: InStock

by schlotzz · from Thingiverse

Small parts from £4 printed to order · UK postage from £2.95, free over £40 · usually dispatched within 2 working days
Arrives damaged? Free reprint, just film the box being opened. Returns policy

Free community design ♥ 5,252 likes ↓ 78,253 downloads

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PLA from £4 plus UK postage from £2.95. We prepare your model, print it across our calibrated production fleet and quality-check it before it is usually dispatched within 2 working days.

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We didn’t design this model. It’s a community file from its original creator, and now and then a file has a fault that only shows up when we print it, such as walls that are too thin or parts that don’t join properly. If that happens we’ll let you know and try to fix the file, which can add a day or two. If we can’t get a good print from it, we’ll refund you in full.

Good to know before you order

TPU has a £11.50 print-order minimum. ABS, ASA, PC, Nylon and PETG-CF have a £46 minimum; PA-CF has a £69 minimum. Delivery is shown separately in your cart.

Need a few parts? Add them to one cart. One order minimum and one postage charge cover the cart: £6.90 for standard materials, £11.50 with TPU, £46 with ABS, ASA, PC, Nylon or PETG-CF, or £69 with PA-CF.

Please check the model files include everything you need before ordering. We print the files as published by the creator, so you receive the parts in the model, not necessarily a finished assembly shown in any photos. These are community designs by their original creators; we manufacture and post them but cannot guarantee fitment for your specific appliance or use case - check the original design page for compatibility.

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

anet Anet A8 bowden coldend cold end delta direct drive extruder kossel kossel mini Minimalistic MK8 printrbot prusa rostock simple Tatsu TatsuMini

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