Robert's feeder feedback

[IRobertI 521]

You *might* need oil for rubbery materials. Personally I've never used oil when printing NinjaFlex.

 

[chrisp 10]

Love the feeder. The only issue I have is when I'm lazy and decide to actually use the change filament option, the filament always seems to slip off the bearing and knurled fitting unless I hold pressure against the bearing. Otherwise my printing experience has been much better since using Robert's feeder.

 

[zumfab 3]

So, what is your opinion? Is this extruder useful for the UMO, especially when taking flexible filaments in consideration?

 

[IRobertI 521]

The feeder on the UMO isn't direct drive and the stepper it uses isn't strong enough to be either, so it's not exactly a drop in replacement.

 

[zumfab 3]

The feeder on the UMO isn't direct drive and the stepper it uses isn't strong enough to be either, so it's not exactly a drop in replacement.

 

I was thinking of making it into something like a hybrid. Retain the stepper and reduction gears since that seems to work pretty well, but take the rest of your design. It would need some sort of UMO compatible mounting system anyway, so doing that would not mean a lot of extra work.

That is all under the assumption that it is actually a useful upgrade.

 

[Nicolinux 288]

Hey Robert,

I am using your feeder for a long time and it works very well. Lately I noticed that the filament slipps off the ball bearing when unloading (yes I am using the firmware loading/unloading). Apparently the ball bearing is not centered on the knurled mantle (tried moving that around). I addes a few shims between the ball bearing an dthe yoke but the filament is still not centered.

Does this happen to anybody else?

As you can see I have added a mettal inlet at the bottom in order to avoid cutting a piece of the bowden tube...

Maybe that's due to a newish UM2 revision. I remember that you feeder didn't have this problem on the first rev. UM2. The yoke (and the m3 bolt) already scrapes the back of the printer.

 

[DidierKlein 729]

Yes i have the same thing, but i don't use the change material stuff anymore since i installed it and had that happen once

 

[Nicolinux 288]

Another thing that I just noticed. When I change filament the old way, I _never_ hear skipping anymore. I wondered why and now I see that the filament is grinded ever so slightly. Not enough to show any extrusion problems but it is still there. I will thighten spring a bit and see if the filament still slips off.

 

[IRobertI 521]

The position of the idler bearing is slightly different from the default, yes. I think I wrote that you may need to adjust the position of the knurled sleeve, or maybe I just thought about adding that.

And... ffs Nico, stop using the auto load of filament, you're breaking my heart ;(

Also, just added a variant of the body that uses the grommet instead of a piece of bowden. Happy now, Nicolinux!?

 

[ccw1984 1]

Hey Robert,

I am using your feeder for a long time and it works very well. Lately I noticed that the filament slips off the ball bearing when unloading (yes I am using the firmware loading/unloading). Apparently the ball bearing is not centered on the knurled mantle (tried moving that around). I added a few shims between the ball bearing and the yoke but the filament is still not centered.

Does this happen to anybody else?

As you can see I have added a metal inlet at the bottom in order to avoid cutting a piece of the bowden tube...

The yoke (and the M3 bolt) already scrapes the back of the printer.

 

Have you tried using the snap-on filament guide? Also I now usually remove/change materials by heating to the atomic pull temp (ie 90 for PLA), opening up the feeder and just pulling it out by hand. Sometimes I do have to remove the bowden tube from the top of the print head and cut off the 'cone' if it's too large to fit, but it leaves me with a nice clean head for the next print.

I did the same thing with the metal eyelets!

I was having the same scraping the back of the printer issue, until I commented on the design on Youmagine and Robert pointed out that the yoke doesn't need a nut, since one of the holes is smaller and designed to be screwed directly into! Also you could use a sex bolt if you find one in the right size.

 

[Nicolinux 288]

The position of the idler bearing is slightly different from the default, yes. I think I wrote that you may need to adjust the position of the knurled sleeve, or maybe I just thought about adding that.

 

I played around with the position of the knurled sleeve, but it seems the filament follows the path given by the hole at the bottom (with the metal eyelet).

 

And... ffs Nico, stop using the auto load of filament, you're breaking my heart ;(

 

Ok ok, sorry. I will try that atomic filament switch from now on.

 

Also, just added a variant of the body that uses the grommet instead of a piece of bowden. Happy now, Nicolinux!?

 

You still didn't add a variant with my name on it. I ARE NOT HAPPY!!!

 

[Nicolinux 288]

Have you tried using the snap-on filament guide? Also I now usually remove/change materials by heating to the atomic pull temp (ie 90 for PLA), opening up the feeder and just pulling it out by hand. Sometimes I do have to remove the bowden tube from the top of the print head and cut off the 'cone' if it's too large to fit, but it leaves me with a nice clean head for the next print.

 

No I didn't try the snap-on guide. I thought that I should avoid friction if it is not needed.

 

I was having the same scraping the back of the printer issue, until I commented on the design on Youmagine and Robert pointed out that the yoke doesn't need a nut, since one of the holes is smaller and designed to be screwed directly into! Also you could use a sex bolt if you find one in the right size.

 

Oh that's a good info. It never occured to me that I could skip the nut... Will try it.

Didn't know about a "sex bolt". Had to refrain from making explicit jokes about it

 

[gr5 2,224]

I think he meant "hex bolt" maybe?

 

[titanoid 4]

Well, it´s obscene indeed, but it https://en.wikipedia.org/wiki/Sex_bolt...

Very useful in some cases!

 

[johank 7]

Also, just added a variant of the body that uses the grommet instead of a piece of bowden. Happy now, Nicolinux!?

 

 

Finally!! :twisted:

 

[Labern 775]

Didn't know about a "sex bolt". Had to refrain from making explicit jokes about it

He must like his printer A LOT to have that on his mind. :grin:

 

[gr5 2,224]

Hardware porn! I want some of these now!

 

[titanoid 4]

Aah, another connoisseur!

They are cute, aren't they?

 

[neotko 1,417]

Yesterday finally finished mounting the IRobertI feeder on my UMo+. So far (only printed the robot) all works great. I'm using it to load 1.75 filament. I used a MK7 on the motor and 104,6 esteps (If i remember correctly). So far perfect print with no underextrusion.

I had to put a plastic nut so the bearing fits the screws I had and used a M10 tap to use my pneumatics on the bowden (I could have modified the 3d to make it easier but I had all dismantled). The youimagine um1 holder I had to 'cut' so my screws work.

It's there any speedtest outthere for 1.75 filament? The gcodes i find are for 2.85

Btw great design IRobertI

[IRobertI 521]

So, would adding this to the youmagine page help, or make it more confusing?

 

Ignoring that it's not necessarily going together in the right order (if you can't figure out the order on your own... yeah, you shouldn't be modifying your printer in the first place).

 

[emilio2 2]

Robert, I cannot see clearly the washer, shown on the last part of the movie than inserts from the bottom, on the filament insertion hole. Is it a tefflon piece or what?.

 

[ccw1984 1]

Robert, I cannot see clearly the washer, shown on the last part of the movie than inserts from the bottom, on the filament insertion hole. Is it a tefflon piece or what?.

 

On this latest revision he has changed it to use the eyelet (aka grommet), from the bottom of the original feeder since the newer ones come with it. You can also pick them up at craft stores or ebay/amazon. The older versions used a piece of bowden tube inserted into a small slot instead (or in my case I used two eyelets).

 

[emilio2 2]

So the new part is "Feeder_Body_For_Grommet" instead of "Feeder_v6_body" ?

My UM2 feeder does not have any part like that. Can anyone point to a picture of such a part?

 

[neotko 1,417]

IRobertI that video deserves a big thanks! Seems I forgot a lot of washers

 

[skinny-kid 65]

Can someone enlighten me on how to get the white clip that holds the bowden tube at the feeder to fit into the hole? Seems like I won't be able to compress the clip into the space.