mazas
RRCRat Rig Community [Unofficial]
•Created by tg73 on 10/8/2024 in #fix-my-print
Regular surface distortion pattern towards end of larger first layers VC4
I did it on vc3 300, which has a shoter gantry than a vc4 300, and vc4 400 is yet longer. I would not bet on success with the vc4 400, but certainly would be interesting to know. For fixing I printed just short stubs, as I was too lazy to cut a proper alu piece. I've since ordered an out-of-spec stub of ti tube to be used instead of this plastic piece, but have not yet found the time to install it. And... it works, so I have less of an incentive to fix it 🙂
1854 replies
RRCRat Rig Community [Unofficial]
•Created by tg73 on 10/8/2024 in #fix-my-print
Regular surface distortion pattern towards end of larger first layers VC4
I’m sure there is a compromise between rigidity and ease of use. In my use case the quality (rigidity-wise) seems good enough. Someone might have different needs, but as I print mostly functional parts, some possible ringing is not a real issue. For decorative stuff that might be a dealbreaker. But I have not done a thorough, meaningful comparison with the stock, so I cannot really say how much worse it is. Good enough for me and really nice to print without heat soaking 🙂
I would not think it is a viable option for a 500 unless you went reeeally slow. But this is based more on a hunch than real experiments or data.
1854 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
I can relate to that feeling, although my biggest issue with the printer was probably building it square :). Also, at this point, since graphs are starting to look reasonable, I might try checking the max acceleration/ringing by printing that klipper l-shaped test print. Doing the IS with the accelerometer is only an approximation, as it does not measure the nozzle tip, comes with its own set of errors and there is no filament or part involved. It might quite well be that you have a well-functioning printer but we just do not know it yet 🙂
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
Well, actually i tried to say that with y movement there is a possibility for twisting/rocking, but that should be visible as z-acceleration. Well, nevertheless, if you can try another location for the accelerometer that would be good.
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
The graphs are looking better, but I am concerned about the second bump. Can you run the graphs with another accelerometer? The beacon is fixed with two screws, and that provides only minimal support for movement in y. It just might be that the second is a phantom.
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
Ok, that belt flapping is also to be expected, and not a major concern.. i believe mine does that as well. That flapping does not seem to be a real problem in printing, and neither can I say that I could see it in the graphs. But 120Hz is probably ok, as long as the motor shafts can handle it. If my memory serves, that will cause the force to go over the spec for the motors though.
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
What do you mean by resonating belts?
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
One rather tedious debugging thing could be to switch to the the stock gantry. Or you could do what I do and leave gantry extrusion away altogether, and use just a single rail. That might not be the final solution, but least both of those should produce nice IS graphs. And I realize that you had food graphs earlier, but somehow we’d need to now figure out what changed
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
Hmm.. is it possible that the dual-rail xy joiner is somehow curled/bent? I do not know what is the orientation it was printed in, but can you check that there is no warping?
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
So, i would not be overly worried about that. Ofc if the rubbing is strong, you should check that the shafts are reasonably straight.
Besides the belts, do you somethig else rubbing?
69 replies
RRCRat Rig Community [Unofficial]
•Created by Arthur_C on 12/31/2024 in #fix-my-resonance
Dampening issue on Y-axis (VC3.1 - 300 enclosed)
That movement is to be expected. The geometry on the pulleys does not self-center (as per their design), and the small variations shaft angle can cause that. Also, the spine fibers in the belt are not absolutely straight. The belt is cut spirally from a large-radius tube, so there is ever so slight tilt in it.
69 replies
RRCRat Rig Community [Unofficial]
•Created by tg73 on 10/8/2024 in #fix-my-print
Regular surface distortion pattern towards end of larger first layers VC4
Makes sense. The probing repeatability I get with a mechanical euclid probe is a few microns. It is way more than with vc4 and Beacon, but still inconsequential compared to other errors in the system.
1854 replies
RRCRat Rig Community [Unofficial]
•Created by tg73 on 10/8/2024 in #fix-my-print
Regular surface distortion pattern towards end of larger first layers VC4
Me too, still running it..
1854 replies
RRCRat Rig Community [Unofficial]
•Created by tg73 on 10/8/2024 in #fix-my-print
Regular surface distortion pattern towards end of larger first layers VC4
Those should help. I was also thinking about them as an alternative to a fully titanium gantry. Perhaps even a carbon fiber backing could help, as it has a negative coefficient and would thus have more change in shape. I have not done any calculations.
1854 replies
RRCRat Rig Community [Unofficial]
•Created by tg73 on 10/8/2024 in #fix-my-print
Regular surface distortion pattern towards end of larger first layers VC4
Good to hear your experience. I am also a bit worried about heat creep, but since there is some success in running even totally without a fan, I'm interested in seeing first hand how that works. Did you encounter any clogs/extrusion issues?
1854 replies
RRCRat Rig Community [Unofficial]
•Created by Flo@GRNbms on 12/15/2024 in #fix-my-print
First layer problem
And it is not me, we did it together with @tg73 🙂
134 replies
RRCRat Rig Community [Unofficial]
•Created by Flo@GRNbms on 12/15/2024 in #fix-my-print
First layer problem
Yes
134 replies
RRCRat Rig Community [Unofficial]
•Created by Flo@GRNbms on 12/15/2024 in #fix-my-print
First layer problem
Yea. If you want to start fast, and don’t mind changing the housing later, i would now start with the “stock sealed” housing and the better fan, running reversed. But that has NOT been tested thoroughly, so take that into account
134 replies
RRCRat Rig Community [Unofficial]
•Created by Flo@GRNbms on 12/15/2024 in #fix-my-print
First layer problem
I have one from them, but I did not want to install until we understood the behavior well enough with the stock
134 replies
RRCRat Rig Community [Unofficial]
•Created by Flo@GRNbms on 12/15/2024 in #fix-my-print
First layer problem
Toro3d is the one I know of
134 replies