Duet Wifi and CR-10
-
@opentoideas the aero is quite good when it works. But it is a little finicky. Bondtech and a V6 seems to be the best alternative right now.
-
@Phaedrux thank you,
looks nice will keep that in mind once I get everything sorted.
-
@deckingman said in Duet Wifi and CR-10:
Can't help with the auto levelling as I don't use any of that stuff - just "home and go" with a simple (but precision) switch.
Thats enough for one night! I now have the probe working, consistent homing and a lot more knowledge of my machine.
while all of the rollers bearings run smoothly the quality is not great and a few had lateral play that was messing things up - obviously the defective ones were in positions where that particular issue was critical to repeatability. having swapped the poor ones to positions where that play wasn't an issue everything seems to be running fine.
I can now run the mesh grid and so on, now that I have probing that works but having just done it ,I realise, I need a lot more understanding as to what it's doing as it made a pretty picture but everything went a bit wonky.
plan for the morning spend some time carefully manually leveling then see if I can make sense of these fancy features.
I might have a decent grip on how it all works by the time I can print again!
-
@dc42 said in Duet Wifi and CR-10:
5 repetitions is rather high. Do you find that the early ones consistently under-correct, and the following one makes smaller corrections in the same direction? If so then you can use the F parameter on the M671 command to speed up convergence.
I've reducing the friction on the z axis and the carriage is carrying extra weight (fans/ducts/z-probe) I get quite a bit of drop in the X axis (maybe 0.5mm) when stepper drive is removed. Sometimes it can take 3 or 4 passes to level.
Initially I went through a range of F values on M671 and found that F1.0 worked best converging the 2 points in my case.
-
@danal said in Duet Wifi and CR-10:
Another vote for replacing Titans with Bondtech BMG. They are MUCH better.
Bondtech BMG here also. Very happy.
-
have you done anything to change the bed mounting?
as my probe relies on contact with the bed even if it is light I am finding that the mounting of the bed is causing some issues.
in the middle the contact is spread between the 4 springs so is good, solid and repeatable
mid point of any edge is only supported by 2 springs so still fairly solid but less accurate.
at any corner however there is only one spring so its 4x more deflection for the same force than at the center and here the spring "cushions" the probe contact to the point that the triggering becomes unreliable.
I could crank the adjusters most of the way down to increase the pre tension on the springs or even solid mount the bed to remove the bounce but then I would lose the manual levelling and I don't think the machine is anywhere near precise enough to maintain the level and I don't know if I want to rely purely on the software levelling.
-
well all day later and this is the result :
strange things I still have to figure out are why I need to home all first - then auto bed level compensation - then grid mesh compensation.
if I miss any step then the next one moves around with the probe at Z=0 which is not great
also after I run any of the auto routines, future Z homes are generating a cumulative error on the Z which seems to b the Z offset on the probe so the only way I can see is to reset the Duo and start again once any of the leveling routines have run.
that said I think this is as good as its going to get and barely outside the 0.1mm resolution I should expect from the probe so I am happy but what do you guys think?
oh yes, can I run the grid for information? it seems that I can only use it to compensate not just to check so while leveling I have had to do a ton of resets which has been a pain!
-
@opentoideas said in Duet Wifi and CR-10:
also after I run any of the auto routines, future Z homes are generating a cumulative error on the Z which seems to b the Z offset on the probe so the only way I can see is to reset the Duo and start again once any of the leveling routines have run.
Which firmware version are you using? This sounds like a bug that was fixed recently.
-
@opentoideas said in Duet Wifi and CR-10:
have you done anything to change the bed mounting?
I've added outrigger rails and replace the springs with 20mm aluminium standoffs to improve build plate stability.
-
interesting, how did you support the bed on the outriggers? same wheels that CR-10 uses with a bracket?
I have given up on these wheels as on closer inspection I have found the bearings have a degree of end float and to be fair these type of bearings are not meant to have any lateral load on them (although as its so low with a 3D printer they get away with it to a degree)
between the flex in the head assembly and the play / flex in the bed mount I cant get any repeatability from the Z axis anywhere other than the center of the bed and even there the flex in the head carriage is an issue.
I have ordered a pile of MGN12 rails and while I wait will start making the brackets and other hardware as there seem to be most of the parts already out there.
it will be interesting to see how these turn out as they were cheap enough that they could be a good fix but with all cheap China copies the quality and amount of work needed will be interesting. many of the reports I have found suggest that with a bit of fettling prior to installation they can be made good and worst case I can mill any hardware if needed.
