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
Just to make sure: you did not reverse the fan?
1749 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
Anyone struggling with the issue: try mounting the fan backwards just to see whether the issue goes away. If it does not help, then your issue is probably something else.
1749 replies
RRCRat Rig Community [Unofficial]
•Created by FlipBreukers on 12/8/2024 in #ratos-support
Fan with PWM from filter unit how to hook up and address
The external mosfet is quite an ovekill and unnecessary IMHO. I would connect the 24v of the fans to either an unused bed heater port on the board (as @TheTik suggested) or directly to the 24V output of the power supply. And then you drive the PWM to control the speed. If you connect to the bed port, you need to make sure the voltage levels are s you expect them to be, so that you get a reliable ground reference. That is why I might suggest using the ground an 24 directly from the power supply, no need to worry about the levels. I’d also connect the ground to as close to the board as possible, to make the ground reference the same as what the board has.
19 replies
RRCRat Rig Community [Unofficial]
•Created by Shades on 10/29/2024 in #fix-my-printer
VAOC LED ring not working
Ok, just be careful with static when working with the board 🙂
28 replies
RRCRat Rig Community [Unofficial]
•Created by Shades on 10/29/2024 in #fix-my-printer
VAOC LED ring not working
The leds are neopixels, and need a series of well-timed pulses on the control pin to turn on. By default they stay off.
28 replies
RRCRat Rig Community [Unofficial]
•Created by FlipBreukers on 12/8/2024 in #ratos-support
Fan with PWM from filter unit how to hook up and address
Is the designer really recommending to use an external MOSFET driver to power the fans? Why not use fixed 24V directly from the PSU and just use the PWM to drive the speed, just like the part cooling fan?
19 replies
RRCRat Rig Community [Unofficial]
•Created by Fierux on 11/30/2024 in #fix-my-mesh
Vcore 500, heat soaked mesh with 1mm+ range
The angle is caused by the bow in the x gantry; the three measurement points for the tilt adjustment are level, but as the back point is at the max bow of the gantry, the mesh will lool like it was angled. One thing that should help is that you loosen the x-rail, heat soak the printer for more than one hour and then re-tighten the rail, strarting from one end of the gantry. That should remove some of tje bending. Alternatively, you could twist the 2020 ”upside down” to see if that helps.
The undulations are a bit unexpected. Perhaps make sure the torque is abt 1Nm for the rail screws, not more.
3 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 feel I am overselling the results.. 🙂
1749 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
Sorry, still working with potential solutions. News isn’t too bad, I hope. If you feel adventurous and have a spare fan, you can immediately try out by reversing the fan, i.e. mounting it backwards. That gets rid of most of the issue discussed here, but of course you might reduce the lifetime of the fan. If you try this, make sure to clean the hotend (cold pull etc) to remove any carbonized residue. Cooling with a reversed fan might not be as efficient as with the stock direction, so there is a possibility of getting the filament jammed. A clean filament path helps, but is not a guarantee.
If the reverse fan does not help, the it is likely that the other mitigations (coming up) might not help either.
1749 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 cannot really say any measurement about the tightness, but judging from some of the sounds/vibrations the head/carriage makes during IS graphing, and the fact that the umbilical has so much effect, I might be tempted to say it is not the tightest. I don’t know how to measure it, really. Perhaps a strategically placed dti with a known torque/force might work?
1749 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 think it is 0.8mm
1749 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 not running scan compensation. Got rid of the need to use it once I replaced the 1mm piano wire with a half-length sloppier version
1749 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
For doing the test here, you should let the printer cool down for several hours, or actively cool it down with an external fan for quite some time. My target has been to start with a gantry that is within 0.2 from ambient.
1749 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 understand. But nevertheless, the measurement would be intersting to fully understand the behavior. And also to make sure my calculations are incorrect. They seem to be correct with alu, but I do not yet have a ti tube, so I cannot measure. Also, something that makes your measurement interesting is that you have a different funnel design in the microlight. Therefore, your measurement would not be directly comparable, but interesting nevertheless. An also, if we see that there is some measurable deflection (lets say 10um), and you do not have a problem with it, it would give us an indication as to what our target could be.
1749 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
But the testing we do is different. The issue we see cannot ne compensated with standard heatsoaking. This is a new, previously unrecognized problem
1749 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
Did u try with cold bed, i.e. the effect of the toolhead only? It will be an interesting datapoint.
1749 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
If you mean the poc flange, then feel free to experiment by all means, but I do not think we can consider it a a very effective solution, even with a ti tube. A bit more is needed, I’d think. Just setting expectations here 🙂
1749 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
But anyway, the obvious solution to the problem at hand would be to remove the bimetal effect. The simple way to that is a ti tube. However, even Titanium does not remove the bending totally, we are still talking about tens of microns for the temperature changes seen here (given, once again, that my calcs are correct). The steel tube would be ideal, but obviously very hard to come by, as they do not exist yet. So, it might seem like a known-to-work solution near-term might be to decrease the thermal load the hotend delivers to the gantry and switch to ti (I ordered mine a few days back :)). Other solutions are of course welcome, and anything that helps is good in my books.
1749 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 do not know if you can mill even a non-machined 1mm tube..)
1749 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
Hmm.. but if it is steel, could you not just drill holes on both sides? Or do you feel it would deform as a result of the drilling, and not have enough of material left for milling the top?
1749 replies