Faster Printing requiring Filament Buffer feeding

[Repman]

@NikosSprocket Could you give me an advise how you printed the "Outlet Part"? I mean this one (outlet.step in attachment):

Outlet.stp

[NikosSprocket]

9 hours ago, Repman said:

@NikosSprocket Could you give me an advise how you printed the "Outlet Part"? I mean this one (outlet.step in attachment):

Outlet.stp 109.99 kB · 0 downloads

It should print fine upside down from the above picture. If it does not stick on your bed then include brim.

[Repman]

OK! Thanks. This seems to work. I added support for the two noses.

[NikosSprocket]

Finally, I uploaded the 3mf and STEP file to Printables:

 

Mellow LLL Plus Filament Buffer Side mount

 

[Repman]

On 3/5/2026 at 9:02 AM, Vernon3D said:

Ok I see it and maybe if you make the area a little thicker so we need to use longer screws Is that and option ? My backpanel is standaard 3 only the side is 6 mm btw.

Thanks for your effort 

Regarding the 45° Mounting:
One option could be to use the standard base and design only an adapter to mount it 45° at the corner. Perhaps with magnets? This makes the system easier expandable and you dont have to change the base for every building situation.

[Repman]

Something like this would make the mounting more modular...

Voron2.4r2-HalterMellowFlyLLLPlus.stl

[mvdveer]

11 minutes ago, Repman said:

Something like this would make the mounting more modular...

Now I like that. Saves me reprinting 4 new "main bodies"

[Vernon3D]

1 hour ago, Repman said:

Something like this would make the mounting more modular...

Voron2.4r2-HalterMellowFlyLLLPlus.stl 59.26 kB · 1 download

Yes this is a great solution. The cutout for the panel side is that for a 3 mm panel ( the back panel)?

[Repman]

To be honest: I just made that a few hours ago as a freeCAD exercize just for fun. In the last picture (detail view) you see the top profile from the voron CAD data with the top panel. Here is a sketch detail with dimensioning:

The panel space here is 7 mm (without foam). I attach the FreeCAD-File, so you can easy change the values if you want.
Feel free to ask for help.HalterFlyMellowPlus.FCStd

 

[NikosSprocket]

5 hours ago, Repman said:

Something like this would make the mounting more modular...

Voron2.4r2-HalterMellowFlyLLLPlus.stl 59.26 kB · 2 downloads

Excellent idea!

Better than my integrated (marketing language for “ours is an overkill design but still buy it” ) solution.

You may want to create a 3-6 7 mm indentation on the other side too.

Awesome!

Nikos

 

Edited March 15 by NikosSprocket

[Repman]

8 hours ago, NikosSprocket said:

You may want to create a 3-6 7 mm indentation on the other side too.

Sure:

HalterFlyMellowPlus-HalterMellowFlyLLLPlus02.stl

 

[Penatr8tor]

Hey all...

Finally got around to building and installing the filament buffer.

I went with the most basic method of functionality, that being, just add power and let the internal firmware do the work.

I also went ahead and designed some mounts based on @Repman design. It has a 3mm notch on one side and a 6mm notch on the other with some chamfers to make it appear more Voron like.

Buffer Mount.stl

 

[Jerazmus]

52 minutes ago, Penatr8tor said:

Hey all...

Finally got around to building and installing the filament buffer.

I went with the most basic method of functionality, that being, just add power and let the internal firmware do the work.

I also went ahead and designed some mounts based on @Repman design. It has a 3mm notch on one side and a 6mm notch on the other with some chamfers to make it appear more Voron like.

Buffer Mount.stl 285.73 kB · 1 download

I need a set of these for a 3030 extrusion. I printed the others and realized they were for 2020. I need to mount them to my RatRig and those are 3030 extrusions. I def wasn’t paying attention. LOL. 

[Jerazmus]

Also, how did you power the buffer? From the board or direct to 24v psu?

[Penatr8tor]

28 minutes ago, Jerazmus said:

I need a set of these for a 3030 extrusion. I printed the others and realized they were for 2020. I need to mount them to my RatRig and those are 3030 extrusions. I def wasn’t paying attention. LOL. 

I'm not doing anything today. I'll create a 30x30 version for you.

Check back in an hour or so.

[Repman]

29 minutes ago, Jerazmus said:

I need a set of these for a 3030 extrusion.

You can change that easily. Take the FC-File from above, open it in FreeCAD (available for nearly all operation systems) and change the sketch to your desired dimension:

On 3/15/2026 at 12:47 AM, Repman said:

.HalterFlyMellowPlus.FCStd

You have to modify: HalterMellowFlyLLLPlus>HalterMellowFlyLLLPlus01>Extrude>Sketch.
Doubleklick on that entry and modifiy the dimensions.

17 minutes ago, Jerazmus said:

From the board or direct to 24v psu?

https://mellow.klipper.cn/en/img/ProductDoc/ExtensionBoard/fly-buffer-plus/basic.webp
For basic functionality (as @Penatr8tor described it) the best way is to power it from the PS. So it does not load the board-outputs.

[Penatr8tor]

19 minutes ago, Jerazmus said:

Also, how did you power the buffer? From the board or direct to 24v psu?

Just wired it directly into a 24v wago I had in the electronics bay.

[Penatr8tor]

@Jerazmus

Here's 3 variations on a 3030 mount.

The difference between variations is the panel thickness offset for the tabs to hold panels in place.

I have one for with 3mm, one with 6mm and one with 3mm & 6mm.

Buffer Mount 30x30_3-6.stl

Buffer Mount 30x30_3-3.stl

Buffer Mount 30x30_6-6.stl

 

[Penatr8tor]

I created one with no panel notches just in case you have no panels. I have a a RatRig V-Core 3.1 with 3030 extrusions as well, so I need a mount for that printer as well.

Buffer Mount 30x30_No Notches.stl

[NikosSprocket]

Good-looking brackets @Penatr8tor!

I powered mine from the CPAP 24V board, which is at the top back of the printer, so I do not have to run more cables; like there aren't enough cables already! Still looking for a serviceable cable conduit to hold the CPAP and the Mellow Buffer's cables to the bottom where are connected to the rest of the electronics.

[Penatr8tor]

1 minute ago, NikosSprocket said:

Good-looking brackets @Penatr8tor!

I powered mine from the CPAP 24V board, which is at the top back of the printer, so I do not have to run more cables; like there aren't enough cables already! Still looking for a serviceable cable conduit to hold the CPAP and the Mellow Buffer's cables to the bottom where are connected to the rest of the electronics.

Thanks  

I'm building another unit for my VzBoT and I could tap into the cpap but I think I have an open wago connection I could use and since everything electrical is stuck to the rear panel... I have lots of choices on both the Vz and my RatRig.

[NikosSprocket]

7 minutes ago, Penatr8tor said:

Thanks  

I'm building another unit for my VzBoT and I could tap into the cpap but I think I have an open wago connection I could use and since everything electrical is stuck to the rear panel... I have lots of choices on both the Vz and my RatRig.

Ah yes!
That's one thing with Voron printers having most of the electronics underneath.

[Penatr8tor]

Just now, NikosSprocket said:

Ah yes!
That's one thing with Voron printers having most of the electronics underneath.

Yeah mine was a bitch, had unscrew the bottom cover and crap but that's a 2.4 for ya.

I will say that the Orbiter filament sensor accepted the filament being fed by the buffer and pulled in enough to grab in the rollers where it then heated up the nozzle and purged the old filament out flawlessly. 

Removing filament is a bit trickier. I hit the button on the Orbiter Filament sensor, it heats up the hot end and then starts retracting and that's where you have to pay attention and hold the retract button on the buffer.

Overall I'm happy with the buffer. My printers are generally pretty dialed in to begin with so there's not a huge improvement but, there is a notable improvement so it checks the box of being a worthwhile addition to the printers.

[Jerazmus]

5 hours ago, Penatr8tor said:

@Jerazmus

Here's 3 variations on a 3030 mount.

The difference between variations is the panel thickness offset for the tabs to hold panels in place.

I have one for with 3mm, one with 6mm and one with 3mm & 6mm.

Buffer Mount 30x30_3-6.stl 125.38 kB · 0 downloads

Buffer Mount 30x30_3-3.stl 125.38 kB · 0 downloads

Buffer Mount 30x30_6-6.stl 125.38 kB · 0 downloads

Thank you so very much!!!!! I love this site. Collaborating with all of you is such a nice thing to have. And it’s not toxic like those facebook groups. 

[Plumpkatt1]

I have installed my mellow LLL Plus buffer and it's working very nicely. 

 

I too am disappointed over the USB connecting. I have it wired the mellow way currently and printing nicely. I do however have the MDM module connected to the buffer though. And I am using the 1.15 firmware currently. 

https://photos.app.goo.gl/goif4jSo5vuv6S9L8

 

https://photos.app.goo.gl/DHGBZvnUKnFUyx3Q6

 

Edited May 5 by Plumpkatt1