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A bowden geared extruder for Rostock - based on Gregs

by RichRap, published

A bowden geared extruder for Rostock - based on Gregs by RichRap Mar 11, 2013

Description

This is a geared extruder for Rostock and other printers, it uses 1.75mm filament and 4mm Pneumatic fittings for PTFE tubes as the Bowden element.

Recent Comments

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You forgot to add bearings to your BOM

Can anyone confirm if these are the right fittings?

http://www.ebay.co.uk/itm/1-8-...

Really appreciate all the info you share. I'm building my first Delta, and am going with your extruder here, and your spectra pulley designs. I can't wait to try dying the Nylon filament:-)

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Instructions

Print out and assemble with Herringbone gears (any to fit Greg's design) and use the 1.75mm filament guide here.

Flip the design if you want it mounted the other way around or if you are planning a dual bowden extruder setup.

I have been running it for about 4 months, works really well - and can mount to t-slot frames if you like.

Sketchup file added so remix it if you like.

BOM as requested -

It's very similar to any of the other Greg's / Wade's Extruders on Thingiverse -
To print the 1.75mm Version -

So you need to print the two models here.

And a set of Gears - I recomend using the Parametric Herringbone Gear Set for Greg's Accessible Wades - by Triffid Hunter - thing:10707

The hobbed bolt is a standard 8MM type, it should be the most common available from many places - check eBay.

Some long M3 screws for the pressure block springs (about 55mm long)

1 x 35/40mm M3 screw for the pressure block.

Two springs or silicone pads.

3/8" or 10mm Pneumatic fitting to accept 4MM PTFE Tube.

A length of PTFE tube 4mm OD 2mm ID

4 x M3 x 10mm bolts for the motors and small gear

M3 nuts x 5

M8 washers - to space the hobbed bolt correctly

M8 Locknut

I think that's it?

Or use the Version by Woodsmoke if you use 3mm Filament.

Comments

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MrBuilder on Dec 14, 2013 said:

You forgot to add bearings to your BOM

flaming_goat on Sep 11, 2013 said:

Can anyone confirm if these are the right fittings?

http://www.ebay.co.uk/itm/1-8-...

alexmigraz on Sep 4, 2013 said:

Really appreciate all the info you share. I'm building my first Delta, and am going with your extruder here, and your spectra pulley designs. I can't wait to try dying the Nylon filament:-)

robo_kid22 on Jul 22, 2013 said:

What kind of Pneumatic fitting do we need I'm not sure what to search for

RichRap on Jul 23, 2013 said:

It's a 1/8" BSP or BSPT push fit Pneumatic connector, you can get them in all plastic (delrin) or metal.

andrewupandabout on May 10, 2013 said:

(1) Downloaded both parts.
(2) Sliced in Slic3r 0.9.9.
(3) Printed in 3 hours with .85 infill.
(4) Knocked off support box.
(5) Perfect fit! Thanks!
Andrew (3dhacker.com)

Frank_The_Rock on May 8, 2013 said:

Hi RichRap, Is it stil the best Extruder to your taste? I am Building my first printer and I will have those print hopefully at work ;o)

RichRap on May 14, 2013 said:

Yes it is, I still prefer a geared design, and herringbone printed gears.
I'm very happy with this for direct or Bowden configuration - Good luck with the first Printer build.

Stuartblarg on Apr 19, 2013 said:

For the herringbone gears can you just use the straight stl files off of Triffid Hunter's thing or are you meant to generate your own? I dont know anything about script's so im not sure how i would go with trying to generate my own gears.

RichRap on Apr 19, 2013 said:

Yes I use them directly, or you can use any others that are designed for Greg's extruder

Eaglezsoar on Apr 16, 2013 said:

What size bearing is used for the idler?

RichRap on Apr 19, 2013 said:

The same sized used on the Extruder! - 608

robo_kid22 on Mar 28, 2013 said:

Can I get a bill of materials ? What hobbed bolt does this use?

RichRap on Mar 28, 2013 said:

It's very similar to any of the other Greg's / Wade's Extruders on Thingiverse -
To print the 1.75mm Version -

So you need to print the two models here.

And a set of Gears - I recomend using the Parametric Herringbone Gear Set for Greg's Accessible Wades - by Triffid Hunter - thing:10707

The hobbed bolt is a standard 8MM type, it should be the most common available from many places - check eBay.

Some long M3 screws for the pressure block springs (about 55mm long)

1 x 35/40mm M3 screw for the pressure block.

Two springs or silicone pads.

3/8" or 10mm Pneumatic fitting to accept 4MM PTFE Tube.

A length of PTFE tube 4mm OD 2mm ID

4 x M3 x 10mm bolts for the motors and small gear

M3 nuts x 5

M8 washers - to space the hobbed bolt correctly

M8 Locknut

I think that's it?

Or use the Version by Woodsmoke if you use 3mm Filament.

idolcrasher on Mar 22, 2013 said:

I printed your nifty bowden set Rich. I have some of these push fittings on hand from when you recommended them to me a while back ;)

Did you manage to tap the hole in the extruder body for the fitting?

RichRap on Mar 25, 2013 said:

The hole is slightly undersized for the pneumatic fitting, all you need to do is use a hair-drier or heatgun and heat the hole - Just a little - then screw it in, gently, wait until it's cold and it will form it's own very strong thread, you should be able to remove and refit many times - not that you should need to remove the fitting as the tubes can be released by pushing the blue ring.

You may need to adjust the hole size depending on the size of thread on the fitting, they usually come in bonkers non metric sizes. I think the ones I have at the moment are 3/8 of a furlong in size!

eatkabab on Mar 12, 2013 said:

Also, what inner diameter PtFE do you use for 1.75mm filament? What inner diameter PTFE would you recommend for 3mm? Basically, how much wiggle room should I have?

RichRap on Mar 12, 2013 said:

I always use 4mm Outer 2mm Inner PTFE tube for 1.75mm filament - works really well.

I would not dream of using 3mm filament in a bowden setup, but other people do, and you can get 5mm tube with 3mm inner, but I expect you should use 6mm with 4mm inner.

eatkabab on Mar 12, 2013 said:

Do these kind of extruders generate enough pressure to drive the filament into the hot end? I find my J-End requiring maybe 4-5lb of pressure for good flow. Is there cause for worry with the PTFE tube? Also, how tightly and how is it affixed on the extruder end? Thanks very much.

RichRap on Mar 12, 2013 said:

These geared extruders can drive with a massive amount of pressure, much more than a direct driven type like the MK7

The reason I use Pneumatic fittings is that with almost all other clamp methods they will work loose or damage the PTFE tube.

They hold the tube really well, with a NEMA17 motor if you don't set the current correctly the extruder can pull so hard it will break the filament in a spool tangle.

The other end (Hot-end) is here - http://www.thingiverse.com/thi...

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