Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post improvements made for UP, and share ideas.
bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Wed Mar 06, 2019 11:41 pm

Hot bed threw me off a bit, there is a tremendous difference in how fast and how hot it gets depending on the speed of the filter fan. (Maybe mine is extra sensitive to this as the printer was delivered without a filter to restrict the airflow?) Weather or not the stepper motors are off/idle also seems to affect the rise time for the heated bed, and I'm sure the print head will as well.

Anyways, if ordering the fan to stay off until heated bed is up to temperature, or maybe even utilize the slicer to turn on the fan at the 2nd or 3rd layer or something like that its possible to get the bed to 75C in 15 minutes when using 24W and 100% duty cycle.

As mentioned in the heated bed thread, the heater seems to have a positive temperature coefficient, meaning the resistance increase as temperature increases, effectively reducing the power as the temperature rises. This actually makes me less worried about using the original wiring with a 24V supply but will need to get out the thermal camera and do a lot more testing before I would recommend that as an option.

I think the printer is more or less able to print now; next step is setting up a slicer profile and fine tune the extruder settings. I expect that to take me longer

Side note; regretting cloned hardware..

Owen Sparks aka Marksman
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Joined: Tue Mar 15, 2016 9:56 am

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by Owen Sparks aka Marksman » Thu Mar 07, 2019 1:47 pm

Great video, thanks for the link.

I see you're running the software via a browser. Does it play nicely with multiple duets on the same network?

Thanks, Owen S.

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Thu Mar 07, 2019 2:18 pm

Owen Sparks aka Marksman wrote:
Thu Mar 07, 2019 1:47 pm
... Does it play nicely with multiple duets on the same network?
I've only got the one for now, but from knowing how it works there is nothing to suggest multiples should be an issue. Each board is hosting their own web server, and obviously each board will get their own IP and hostname from you or your router.

Got the extruder calibrated and working on the cura profile. This is the actual first print, still some tweaking to be done. Its ABS, and it did lift a little because it printed on 45C with both doors open.

There are a few quirks left to iron out, but I think I can say I'm off to an okay start here.
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Owen Sparks aka Marksman
Posts: 610
Joined: Tue Mar 15, 2016 9:56 am

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by Owen Sparks aka Marksman » Thu Mar 07, 2019 2:34 pm

Excellent work and thanks for the network info.

Cheers,
Owen S.

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Thu Mar 07, 2019 10:58 pm

Seems that was a lucky first shot.. :lol:

Take a break and poke it some more when I get the correct FPC adapter and can wire up the case LED and see whats happening, not having success with raftless prints. However really pleased with the improved surface finish on the side of that first print, compared to the patterns the original electronics or slicer left behind on prints.

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Raftless!

Post by bjorn » Sat Mar 09, 2019 1:58 pm

Found the culprit; the config generator hadn't actually made a config entry for the Z limit swithc, yet it did kinda work. That means its less usefull to share the config.json file as it will generate bad config. Sharing the full .zip instead. This also includes my Z-first homing, as opposed to the normal XY, then Z homing which seems to be standard.

Anyways, as the title suggests, with Z height tuned to +/- 0.1mm across the bed printing raftless seems to work, at least for smaller items like the calibration cube. Got some fine tuning left to do with the dimensional accuracy but all in all its coming along nicely and quietly.
The attachment IMG_20190309_144605397.jpg is no longer available
(printed two at the same time to help with the small details and short layer times)

Received the little 40 pin extension so could mount the front LCD and close that up as well. Will print some sort of mounting adapter for it, but for now its just tucked in there.

Oh, and case LED are now temperature controlled, if bed or hotend goes over 25C lights come on. Subject to change.
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bjorn
Posts: 172
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Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Sun Mar 17, 2019 8:53 pm

Not much progress as of late; still waiting for parts to replace the heated bed and finish off the FPC adapter for the heated bed and LEDSs/switch/door.

While trying to tune the print profile it seems I got a clogged nozzle so that kinda threw me off; been so used to at least the extruder working well that I didn't stop to consider it being at fault. So with that out of the way its back to tuning, and waiting, and some other projects that sneaked up on me..

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Sun Mar 17, 2019 9:30 pm

D'oh!

When you keep X and Y as designated by Tiertime you get left hand threads when printing right hand threads.. Need to have a think about wheather to adopt the Tiertime ways or to use the normal convention of having the bed move back to front in the Y axis and extruder left to right on X..

Lesson learned, don't use symetrical objects for test prints :D

Owen Sparks aka Marksman
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Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by Owen Sparks aka Marksman » Mon Mar 18, 2019 7:41 am

bjorn wrote:
Sun Mar 17, 2019 9:30 pm
D'oh!
Lesson learned, don't use symetrical objects for test prints :D
Thanks for brightening my morning, so many people would have hidden such a numpty error, it's great to see someone putting their hand up and making fun of themselves ;)

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Mon Mar 18, 2019 5:33 pm

Hehe, I don't take myself very serious - no one else does, so why should I right? But I guess my "problem" was I've been printing functional pieces while testing, and they happened to come out okay even if mirrored here and there. Right up til the point where I printed threads, which were the correct size but didn't fit. I almost swapped back to the original board to test...!

Anyways, after careful consideration it's been determined that keeping the weird Tiertime coordinate system is likely to cause more issues than just changing it over to the conventional setup.

Not sure I want to add graphics showing what the "correct" setup for the coordinate system in case some one sees it and think its for the real Up Mini. But X now moves left to right and homes to X0, Y moves back to front and homes to Y120, Z stil moves up and down and homes to Z120.

But now whats left of my Y (or used to be X?!) belt has disintegrated to the point where its skipping steps. So I guess its a timeout until a miracle happens and something gets replaced by someone.

Owen Sparks aka Marksman
Posts: 610
Joined: Tue Mar 15, 2016 9:56 am

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by Owen Sparks aka Marksman » Mon Mar 18, 2019 5:47 pm

Sounds great. The TT coordinate system caused Simplify3D's variable layer settings to die (possibly fixed in later versions but I'd lost the will to GCODE before it was updated) so it's good to see you going down a more conventional route.

Any chance you could stop messing about putting this in a Mini and put it in an UPBOX instead? 8-)

Owen S.
Last edited by Owen Sparks aka Marksman on Tue Mar 19, 2019 9:15 am, edited 1 time in total.

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Mon Mar 18, 2019 6:25 pm

Sure, just send me a UPBOX and I'll make it great again ..

Looking at this it should be even easier to convert the UPBOX, its all 0.1" headers
https://fccid.io/2AAHW-3DP-25/Internal- ... os-2530363

Not sure if the LCD would be as a clean fit though, but looking at the FCC photos the board around one of the bed mosfets look kinda burned .. bad pr..

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Tue Mar 19, 2019 12:48 pm

Some of the parts for the heated bed is on, or at least one of the two options that will be tested.

This is a low profile heatsink, chosen because the fin spacing just about fit the pattern for the heating cable to be laid in, is slightly oversized and has 3 M3 holes on the side which I can mount on ball joints which in turn will be supported of springs and adjusted by a screw from under the carriage for the bed. Only thing I need to do is put it on the chop saw and trim one edge to size, and a little dremel work with the heat sink fins so the cable doesn't protrude. And sand or mill the top perfectly flat although it was surprisingly flat to begin.

Everything will be held down with red high temperature silicone, and it should end up as about 50W @ 230V, and a 10% of the temperature coefficient of copper so less affected by the increased temperature. Will likely put a 80C thermostat on it, and a 90C thermal fuse to keep it from overheating and softening the internal ABS parts.
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bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Thu Mar 21, 2019 2:20 am

Holy crap that worked better than I would have dared to dream of. Maybe I can cut down on the amount of aluminium for the bed, because this was plenty rigid and had zero temperature gradient.

I just hooked it straight up to 230V and let it sit for 3 minutes while recording the whole thing, and it just evenly got up to about 55C in about 4 minutes. At which point i reconed the poorly conducting loose wire would be getting hot enough to literally pull the plug on the test. Will cut down the length of the heater by 10% and skip two rows i think, then tack it down and see.

Another lesson learned; if buying high temperature heat shrink to protect the joint between the supply line and the heater wire, make sure you have hot enough air to shrink it (or china sent me PTFE tubing and not heatshrink...)
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tiertini
Posts: 5
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Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by tiertini » Thu Mar 21, 2019 7:17 am

Hey bjorn, I am closely following your report here, thanks a lot for this interesting thread! Sadly you are engineering what the chinese people should have done before selling it as ABS printer, shame on them!

Can you tell me which IR cam you're using? The pics look great ;)

Owen Sparks aka Marksman
Posts: 610
Joined: Tue Mar 15, 2016 9:56 am

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by Owen Sparks aka Marksman » Thu Mar 21, 2019 9:02 am

Sweet. That looks great.

At work I'm partial to swapping people's rolls of solder with a roll of link wire when they're soldering...

O.S.

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Thu Mar 21, 2019 9:03 pm

If you liked that, you'll love this.
(20 to 100°C in 8 minutes flat 8-) )
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Owen Sparks aka Marksman
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Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by Owen Sparks aka Marksman » Fri Mar 22, 2019 8:13 am

Now that's a heated bed!

Owen S.

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Fri Mar 22, 2019 12:55 pm

Yeah, but not sure I want to put that beast on top of the ABS parts that hold the bed - gonna have to look into some insulation and shielding of the parts at least - which would cost me even more Z height, of which I'm already loosing some.

But at least I can get up to temp if I deem the rest of the printer capable of dealing with the heat.

(I'll add it shortly anyway, but won't let it go past 75C until I'm sure it won't degrade the internal ABS parts, at 75C on the bed the chamber temp seems to be around 50C which is enough to consider cold air for the electronics. Sigh.)

bjorn
Posts: 172
Joined: Fri Aug 10, 2018 6:00 pm

Re: Up! Mini 2 + Duet electronics! (Linear rails and real hotbed!)

Post by bjorn » Fri Mar 22, 2019 3:16 pm

tiertini wrote:
Thu Mar 21, 2019 7:17 am
Can you tell me which IR cam you're using? The pics look great ;)
Seek thermal compact. Its a micro usb dongle to my phone. Not as good as Flir for most things, but it does have wider temperature range than flir, so better for electronics.

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