Time to share. When my basement is more clean I'll make a video. The build volume is 610 x 610 x 760mm.

-Fully enclosed by means of window shrink wrap over lightweight doors. With the basement around 50F and the build plate at 55C, the internal temperature stabilizes at 70C with no additional heating, "Space blanket" covering on build plate and downward-facing top surface of printer help reduce radiative heat loss.

-It's meant mainly for production work. I have both single- and four-extruder toolheads which mount via a kinematic quick-change end effector. No screwing and unscrewing, and the height registration really is repeatable. Spring-loaded latches hold the toolheads in place (no screws). The quad-toolhead subdivides the HBP into 12"x12" squares for 4x parallel printing. I've only made test prints with that toolhead so far, but it works.

-HEPA filtered exhaust fan.

-I used guide tube intended for 3mm filament even though I run 1.75mm filament. The tube paths are so long that the narrower guide tubes gave carbon-filled filaments too much resistance. This works just fine though, and the filament seems much less likely to break within the guide tube.

-The HBP has 5 zones: 4 12" square silicone heater pads, and a nichrome wire permieter wire, to counteract the temperature gradient at the edge. The Duet moderates each zone very nicely. The heaters are plugged into AC, which would draw over 3kW with everything on. To avoid such large surges and let it plug into a 15A breaker, a Variac is used to reduce the peak power to a more sane 1kW.

-A large (14") Raspberry Pi-powered touchscreen provides access to Duet Web Control.

-All the white plastic parts in the pictures were self-printed. The control panel is in two pieces.

-Because I really don't want to burn my house down (this runs often when I'm not home):

• 8 smoke sensors, any one of which will turn off a master relay. The arduino-powered logic for that is powered separately. Each toolhead has a smoke sensor next to each extruder, and there are others peppered around the electronics, and over the big Variac.
• A separate, off the shelf HAVEN automatic fire extinguisher, which activates on its own if the temperature gets to 135F.

~Justine

Hello all,

About a year ago I posted about my large format build (https://forum.duet3d.com/topic/4914/large-format-printer). At the time I intended to put up a video, but just got around to it. That thread is locked now so I'm posting here.

All the design files are available if anyone's interested: http://www.justine-haupt.com/LargeFormatPrinter/Build/

The video: https://youtu.be/fzByhJ9Smns

~Justine

Oh good, fixable stuff! Okay, thanks.

Whoa thanks everyone. I'll take some detail shots of the toolhead mount soon. Also been debating about whether to publish the BOM and design files.

By the way, that big black bowl-looking thing is half of an integrating sphere.

FYI, the "Fallback procedure #3" says to use 1.17, but no matter, it looks like it's an issue with the tk8.5 library on Debian. Seems like everyone who's running it on Linux is using Ubuntu.

But it's fine, I just tried BOSSA 1.8 on a Windows VM and that worked and my Duet has firmware again. Thank you as always!

Now to order that replacement fuse...

Gah I don't know why I didn't think of that. Thanks.

Actually I got an external fan going and I think it'll be okay until the print finishes anyway.

I have a very long print running right now and someone from the news media is about to arrive at my house to report an unrelated project, but I'm probably going to wind up showing them my big printer too. The thing is I'm getting a heater fault on Drive 3 (which is one of the four extruders) and I can see upon inspection that it's a failing bearing on the Titan Aero extruder (the "bearing-gate" issue strikes again, as well as Murphy).

That tool is P1 and is defined as follows in config.g:

M563 P1 D0:1:2:3 H1:2:3:4 F0:3:5:7; Define tool 1 (P1) to use drives 0, 1, 2, and 3, and heaters 1,2 ,3, and 4.
G10 P1 S0 R0 X0 Y0    ; set tool 1 temperatures and offsets

And in the gcode starting script (in Simpify) I have this:

M567 P1 E1.0:1.0:1.0:1.0	;Set mix ratio to 1:1:1:1

I'm thinking there must be a gcode commad I can send to turn off (not just stop) ONLY D3 during the print. Obviously the part that that extruder is working on will fail but I'd rather not risk burning out drive 3 on the Duet.

Any quick advice?

~Justine

Hello all,

About a year ago I posted about my large format build (https://forum.duet3d.com/topic/4914/large-format-printer). At the time I intended to put up a video, but just got around to it. That thread is locked now so I'm posting here.

All the design files are available if anyone's interested: http://www.justine-haupt.com/LargeFormatPrinter/Build/

The video: https://youtu.be/fzByhJ9Smns

~Justine

FYI, the "Fallback procedure #3" says to use 1.17, but no matter, it looks like it's an issue with the tk8.5 library on Debian. Seems like everyone who's running it on Linux is using Ubuntu.

But it's fine, I just tried BOSSA 1.8 on a Windows VM and that worked and my Duet has firmware again. Thank you as always!

Now to order that replacement fuse...

dc42,

When I try connecting with Sam-ba, I get the error Board Description File not found: expected integer but got ""

Any clues on what's going on? Bossa 1.8 on Debian is going to be another rabbit hole.

Oh good, fixable stuff! Okay, thanks.

My machine has been running perfectly, though use has been sporadic in the past few months. I have both single extruder and four extruder toolheads that I can switch between, and everything has been running good.

Today I tried running a print and every single one of the 4 extruder thermistors, plus the bed thermistor (the one out of five bed thermistors that I can monitor from DWC) comes up as 2000 degrees with "Error: Temperature reading fault on heater X: sensor open circuit".

The NTC 100K thermistors are all confirmed connected. Checked each one with an ohmmeter right where the cables connect to the Duet headers and they're all good. I have multiple toolheads and tried swapping out as a sanity check. Same thing. I tried plugging a separate NTC 100K thermistor right into one of the inputs on the board. Same thing. The thermistors are connected correctly.

If it were an error with just one temperature channel you might blame an actual heater fault, but I have 9 (NINE) temperature sensors on this machine, 5 of which I can monitor from DWC, and every one I can see is giving me a fault. All the same fault. There's no sign of an intermittent connection, and the machine ran fine the last time I used it. Nothing has changed since then. Haven't touched the config files, nor the firmware, nor turned it on.

I checked config.g. Looks the same as it always did. I deleted all the files from the SD card and copied my backup files over. I updated the firmware from 1.20 to 1.21. Same, same, same.

To reiterate, wiring has not changed; nothing has changed. I've tried multiple toolheads.

I convinced myself that everything is in perfect order, as it has been. Perhaps the firmware was corrupted some how? Cosmic rays ruining my day? The axes move normally and nothing else seems amiss. Is there a separate chip that handles temperature sensing? Did that go bad?

So I tried the "erase" button, thinking I would REALLY reload the firmware. Sam-ba won't connect, and neither will BOSSA. By the way, the version of BOSSA in the Debian apt repository does work in GUI mode. I tried multiple USB cables thinking I might have a stupid charge-only cable, but I don't have a way to be sure my cables are good (just realized not a single other device in my house actually uses the micro-USB B for data).

Possibilities there are that I'm just having bad luck getting the firmware to flash due to bad cables or some other annoying thing, OR the microcontroller really did get corrupted, and so royally that I can't even flash it.

I really think this is a hardware issue. Looking for guidance. I'm at the point that I'm willing to throw money at it and buy new boards (Duet+Duex5).

~Justine

Whoa thanks everyone. I'll take some detail shots of the toolhead mount soon. Also been debating about whether to publish the BOM and design files.

By the way, that big black bowl-looking thing is half of an integrating sphere.

Time to share. When my basement is more clean I'll make a video. The build volume is 610 x 610 x 760mm.

-Fully enclosed by means of window shrink wrap over lightweight doors. With the basement around 50F and the build plate at 55C, the internal temperature stabilizes at 70C with no additional heating, "Space blanket" covering on build plate and downward-facing top surface of printer help reduce radiative heat loss.

-It's meant mainly for production work. I have both single- and four-extruder toolheads which mount via a kinematic quick-change end effector. No screwing and unscrewing, and the height registration really is repeatable. Spring-loaded latches hold the toolheads in place (no screws). The quad-toolhead subdivides the HBP into 12"x12" squares for 4x parallel printing. I've only made test prints with that toolhead so far, but it works.

-HEPA filtered exhaust fan.

-I used guide tube intended for 3mm filament even though I run 1.75mm filament. The tube paths are so long that the narrower guide tubes gave carbon-filled filaments too much resistance. This works just fine though, and the filament seems much less likely to break within the guide tube.

-The HBP has 5 zones: 4 12" square silicone heater pads, and a nichrome wire permieter wire, to counteract the temperature gradient at the edge. The Duet moderates each zone very nicely. The heaters are plugged into AC, which would draw over 3kW with everything on. To avoid such large surges and let it plug into a 15A breaker, a Variac is used to reduce the peak power to a more sane 1kW.

-A large (14") Raspberry Pi-powered touchscreen provides access to Duet Web Control.

-All the white plastic parts in the pictures were self-printed. The control panel is in two pieces.

-Because I really don't want to burn my house down (this runs often when I'm not home):

• 8 smoke sensors, any one of which will turn off a master relay. The arduino-powered logic for that is powered separately. Each toolhead has a smoke sensor next to each extruder, and there are others peppered around the electronics, and over the big Variac.
• A separate, off the shelf HAVEN automatic fire extinguisher, which activates on its own if the temperature gets to 135F.

~Justine

It's alive! Thank you.