Copper/Bronze/BrassFill on the MMU  

Re: Copper/Bronze/BrassFill on the MMU

Yes, I printed BrassFill. No problems at all.

Use Slic3r profiles. 🙂

What problems do you have specifically?

Re: Copper/Bronze/BrassFill on the MMU

What problems do you have specifically?

Blockages when printing; in the heat break just at the point where the heat break meets the heat sink.

Heat creep is very bad with metals and the filament is simply filling the void, solidifying and sticking to the heat break.

I have set 0 retraction, tried temps from 180 through 225 and speeds from 10mm/s through 60mm/s.

Blocks almost every time.

Peter

Re: Copper/Bronze/BrassFill on the MMU

Filament Temp: 210
Bed: 50
Extrusion multiplier: 1.3

Cooling:
Keep fan always on
Auto cooling

Fan speed: Min: 85, Max: 100

Retraction length: 4

Speed
Perimeters: 40 mm/s
Infill: 60 mm/s
External perimeters: 30 mm/s
...

Re: Copper/Bronze/BrassFill on the MMU

Thanks

I suspect a bad spool of filament but I will try on my other printer and then open my second spool.

Peter

Re: Copper/Bronze/BrassFill on the MMU

Peter,

I have installed some insulation between the heat block and the heat break cooling fins.

http://shop.prusa3d.com/forum/improvements-f14/extruder-fan-specification--t1524-s220.html#p39695

In theory this should help your problem. But since I don't have a reliable way to create clogs, I don't know if this theory holds up in practice.

You do 😉

If you try this, and it helps prevent clogs, let us know.

Re: Copper/Bronze/BrassFill on the MMU

Peter,

I have installed some insulation between the heat block and the heat break cooling fins.

http://shop.prusa3d.com/forum/improvements-f14/extruder-fan-specification--t1524-s220.html#p39695

In theory this should help your problem. But since I don't have a reliable way to create clogs, I don't know if this theory holds up in practice.

You do 😉

If you try this, and it helps prevent clogs, let us know.

Aaron, thanks for this. I did find it more reliable printing at 255 degrees with more heat crept upwards which kept the filament soft.

It looks very much as though I have resolved the problem now. I switch to my older MMU printer and it's just working. 200 degrees and high-ish flow rates.

In theory I have 2 printers which are set up identically and they have both produced the same result in the past (except the old one has worn bearings and a bit of bed wobble). But there has to be some hardware difference between the two; I don't know what that difference is and right now, I don't particularly care...

Peter

Re: Copper/Bronze/BrassFill on the MMU

Here's the result:

Peter

Re: Copper/Bronze/BrassFill on the MMU

Here's the result:

IMG_20170825_214525.jpg

Peter

Wow... not to necropost to a thread but damn that looks amazing! Is there a site with info on working with metals in 3dprints? Does it need hardened nozzles like the carbon fibre stuff?

I'm still new to all of this but that looks absolutely gorgeous!

Re: Copper/Bronze/BrassFill on the MMU

Wow... not to necropost to a thread but damn that looks amazing! Is there a site with info on working with metals in 3dprints? Does it need hardened nozzles like the carbon fibre stuff?

I'm still new to all of this but that looks absolutely gorgeous!

It looks even better now, after a polish and being left for a few days.

I actually printed that with a standard brass nozzle; I put my hardened steel nozzle in the other printer and when it would not print, I just moved over to this printer. I guess I screwed the nozzle, but it still seems to be printing OK...

Peter