DraconisCaesicius da blue dragon
RRCRat Rig Community [Unofficial]
•Created by Mr. Hye on 4/28/2024 in #fix-my-print
Rough artifacts on surface
If you swap the duct and it all automagically works again, you can call one daffy duct and the other donald duct.
61 replies
RRCRat Rig Community [Unofficial]
•Created by Mr. Hye on 4/28/2024 in #fix-my-print
Rough artifacts on surface
I agree with
61 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
However, while the profile of the visual artifacts matches the spacing of the belt teeth exactly, I am disinclined to believe it would be the stepper motors.
162 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
Now, there is a different pathway - it could be the stepper motors.
162 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
After you've sorted all that out, then you can think about belt tension, elasticity, and tooth deformation due to tension and loading.
162 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
Once you've sorted out those design interface problems, you can progress to the mounting of your pulleys.
Pulleys should run straight and 'true' - especially for positional control systems. Otherwise you will see artifacts like you have described.
Now, here's the thing - it's one thing for a pulley to run 'true' when it's got no load on it. It's another to make sure it's true with a belt on it.
This is why you need to have a solid mounting point for your pulleys - at the very least, you need to use a bolt with a shank. Best would be a turned or ground rod, secured at both ends with a press-fit tolerance.
162 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
Another issue is that the pulleys for a toothed belt MUST be arranged such that the pulleys and belt are all in the one plane. Otherwise you WILL have the belt 'walking' and rubbing on the sides of the pulleys and wearing.
162 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
Belt tracking is adjusted by setting the relative angles of the pulleys the belt runs on. If you want a real-world upscaled example, go look at a linisher belt and see how the tracking mechanisms work. They literally adjust the angle of the front pulley to make the belt 'walk' from one side of the pulley to the other and correct any drift.
162 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
First up, you need to consider the interface between the belt and the pulleys.
The profile of the belt teeth and the pulley teeth MUST match precisely, or you will see that problem.
If your pulleys were manufactured on a failing production tool, you might observe that the profile of the pulley teeth is different from clockwise to anti-clockwise. That would explain your issues being more pronounced one way than the other.
162 replies
RRCRat Rig Community [Unofficial]
•Created by Maba_Kalox on 6/7/2023 in #fix-my-print
belt ripples artifact
@Maba_Kalox What you saw is a result of the belts.
Now, that can be transmitted from belt to print through several different pathways - but to go looking, you need to consider what mechanical interfaces there are between the belt and the rest of the machine.
162 replies
RRCRat Rig Community [Unofficial]
•Created by passive-yellow on 11/1/2023 in #fix-my-printer
Rapido UHF Hot-ends... Junk???
Do you have something that's interfereing with your printer like a cat, rodent, child, or similar?
6 replies
RRCRat Rig Community [Unofficial]
•Created by hilarious-sapphire on 11/1/2023 in #fix-my-printer
Rapido UHF Hot-ends... Junk???
That's very much not normal, and I would be hitting up the vendor or Phaetus to get either warranty, failure analysis, or a discount on another.
6 replies
RRCRat Rig Community [Unofficial]
•Created by optimistic-gold on 5/7/2023 in #fix-my-printer
Belts Binding in specific spot
If belts are over tightened, depends how badly you damaged them.
It also depends on how much print inaccuracy you're willing to put up with.
Belts are replaceable items when:
There is visible damage to the belt such as severe cracking, thinning / stretching, or teeth missing / damaged.
A belt that is slightly bent / warped will usually straighten itself out when put in a machine with a good setup on the pulleys.
111 replies
RRCRat Rig Community [Unofficial]
•Created by plain-purple on 5/7/2023 in #fix-my-printer
Belts Binding in specific spot
Afaik the OP fixed it, the deformation was in the plastic parts, and as a result of either overtightening or deformed parts.
111 replies
RRCRat Rig Community [Unofficial]
•Created by absent-sapphire on 5/7/2023 in #fix-my-printer
Belts Binding in specific spot
Short version - some kind of deformation in the plastic parts led to the belts "walking". Belts walk when the pulleys are not running true, or there is an outside force acting on one part of the belt.
A belt will "walk" to the effective larger diameter side of the pulley. Ie. if you have a tapered pulley, the belt will walk to the large end of the taper every time. This feature is exploited on linishing machines and other belt grinding / sanding machines. The belt "trueing" mechanism is literally an adjustment on the axle angle of one of the pulleys.
111 replies