A place to track all things related to the LulzBot TAZ 6
Mon, Sep 30
@logan Any objections if I close this one down? I think we have all the gcode files updated at this point.
Mon, Sep 23
Correction: .165 will have the lower current, not .164.
FW .164 has the lowered current. You could try that too.
Sep 20 2019
Sep 19 2019
I have a Workhorse here I can test with. Do you have any recommendations on a way to test for skipped steps?
I agree to lowering the current down but I think we should make sure the lowered current is tested on the TAZ Workhorse before we release firmware with the change. It would not be great to replace a small report of driver failures with a greater set of reports of skipped steps. Should be fine but would rather we do some testing fine.
The higher current on the Workhorse came about because it is the current used on the TAZ Pro. But I agree it makes sense to match it to the settings on the TAZ 6 because the electronics are the same.
@kent That comparison is exactly what I wanted to do, but hadn't gotten to it yet. Thank you!
Sep 18 2019
In the short term, I recommend lowering the currents back to 175 for X and Y. This is low risk because this is a very similar system to TAZ 6 and we have lots of testing on TAZ 6.
@kent the change from 175 to 180 changes the current from .97A to 1A so this is only a 30mA change.
@kent when did we increase the current? i agree that we could reduce the current as we are not seeing skipped steps
The pro already has a heatsink. the trinamic drivers run much cooler than the allegro ones but they are still pretty hot respectively.
What has me scratching my head is that if we know they are a common failure point, and we know that heat is a major contributing factor, why would we increase the driving current (and resulting heat)? Sometimes, increasing the current makes sense, when you are seeing skipped steps and you stay far enough below the maximum operating temperature in the steady state that you aren't risking burning the motor driver out, but I don't think we have been seeing skipped steps, at least, not ones that can be attributed to too-low drive current, and we have been seeing heat related driver failure.
driver failures have always been fairly common on the rambo boards FWIW
Workhorse stepper driver current settings: https://code.alephobjects.com/diffusion/MARLIN/browse/devel/config/examples/AlephObjects/Redgum_TAZWorkhorse/Goldenrod_HardenedExtruder/Configuration_adv.h$795
I can look at the board but my observations are that all the motor driver chips (Alegro 4982s) run very hot. This has always been the case, especially with the TAZ series. This isn't a show stopper but the fact that the motor drivers run very hot increases the frequency of failures. At this point, about all we could do is add a back heat sink, like the one on the TAZ Pro. This may cool the motor drivers by a few degrees and lower the chances of random failures.
Sep 17 2019
@mjpelletier I just pulled a RAMBo V1.4a out of a workhorse from upstairs (51NA-1007). It had the x motor driver burn out on it. It was very hot to the touch and the motor was having a bad vibration and strange movement. I will be sending it over for you to evaluate.
Sep 16 2019
Being that TAZ 6 is no longer in production I am closing this request.
Aug 25 2019
Aug 20 2019
Jul 31 2019
Jul 30 2019
Jul 22 2019
Jul 15 2019
I am currently going back through the instances of failures listed above in a bit more detail and thus far I have found at least 1 additional issue that I listed that upon closer inspection looks to not actually a RAMBo issue. I wasn't able to get through everything today so I will have to finish and update this on Friday when I am back in. I just wanted to update to make sure that people knew it is still on my radar and I should have things better situated on this ticket on Friday. Sorry for the delay!
@TyTh good on ya
I have already set up an RMA to send him the new one-piece as well.
Since he's seeing the exact same issue as before the RAMBo was swapped, has everything else been checked? Specifically the internal and external bed power harness that @kent suggested checking in the ticket, which is a common failure point. If that hasn't been checked you should consider sending the new one-piece version along with the RAMBo.
This is the customer from ticket ID 81753, mentioned above
A customer is talking about this on social media. Referred to Ty to get more info and resolve his issue.
Jul 12 2019
Nevermind, I now see that it is a TAZ 5 so that wouldn't be as straightforward. Disregard
@Galadriel Ouch! Missing 90% of the LCD header. Have you suggested upgrading to 1.4? I'd send them the harnesses free of charge at this point given their trouble, personally.
@kent @mjpelletier @Steven New one to add to this list, ticket ID 207,731. Customer bought a new 1.3L RAMBo from us and it came with pins missing, based on photos looks like the pins were never installed. Reference for purchase of board: SO103180.
We will be sending customer replacement board, would you like us to get this one back so we can check so serial number on the board or anything?
@kent Here is a list of RMA's that resulted in either a printer coming back or a board being sent out: