RepRapPro mini extruder

[hoff70]

Reprap Morgan 1.75mm extruder

In case anyone missed it…

Is this still the preferred extruder? I just ordered some brass and tooling to make the hobbed adapter. Went with 3/8″ (.375″) diameter stock which is pretty close to 10mm at 9.95mm plus some 6mm taps for hobbing.

Thanks

[Quentin Harley]

Yes. This is probably the most robust printable 1.75mm extruder out there. Kudos to Reprappro for the initial one (more than good enough for normal clean hot-ends)

Modified it to use cheaper bearings, and sport beefier filament pushing power.
Managed to print a whole roll of filament through a blocked hot-end…

[hoff70]

Awesome! I have some bearings on order and enough brass stock to make several hobbed adapters. I’ve hobbed a couple of steel bolts and I’m hoping brass will be a little easier to work with.

I was a little worried about the press fit small gear but if it gets the Q seal of approval \o/

[hoff70]

Oh Quentin, You say you used a 6mm tap for hobbing?

Thanks

[hoff70]

The plain 5 spoke gear on the extruder is just way to pedestrian for a Morgan:

[Quentin Harley]

Yes. M6 makes the teeth a decent size – helps prevent the extruder eating away at the filament.

Nice looking gear you’ve got there

[Quentin Harley]

The knobs on the sides will make it easier to turn manually as well.

[hoff70]

It printed pretty well:

I was thinking about painting it red to give it a “steam valve” look. Gonna have to keep paint out of gear teeth though…

I also rigged up a simple slip fit extruder bracket that will make it easier to remove the assembly for fiddling. It seems pretty secure for now so hopefully it will stay put during operation.

[Quentin Harley]

Looking good!

Tell me, did you have to modify the extruder to fit the push-fit PTFE pipe fitting? If so, what was required?

[hoff70]

Thanks Q! I just changed the stl a bit and made a counterbore on that end. I didn’t worry about threads because I have a tap. You could probably get away with no threads because the threads are shallow.

I’ll post up some dimensions.

I have push fits on my other printer and wouldn’t be without them. Not entirely necessary but a nice upgrade!

I’m waiting on some taps and stuff to make the hobbed adapter. Hopefully I can help some folks out who don’t have the equipment to make one.

[Quentin Harley]

I am about to get e3d V6 hotends, and push fit one side will need push fit on the other side.

[hoff70]

Thanks Q! I thought 6 spokes a bit busy:

I’ll upload stl after I print it if it looks OK.

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