RE: Revo Micro installation on my Mini+
It is weird in that it runs when the unit turns on, so the wiring seems to be right- but you are right,that was my first thought, a loose or intermitent connection.
What I did do is upgrade to the 4.3.4 firmware for the Mini. I had also 'upgraded' to the mini+ sensor. For some reason, that worked? Fan spins on start and now for 3 times after 2 restarts, the fan turns at 50C, stops at going below 50, and will start again.
So, maybe something in there is tweaking the fan setting???
RE: Revo Micro installation on my Mini+
On the length of the feed tube, what I did is cut the tube right next to the ‘olive’ on the downstream slide, and then slid the olive off. The tube wasn’t that deformed, at least it was round. I then used that into the EVo fitting. Didn’t have any grinding in the couple of times that I loaded filament, and it seems to have stayed in place.
RE: Revo Micro installation on my Mini+
It is weird in that it runs when the unit turns on, so the wiring seems to be right- but you are right,that was my first thought, a loose or intermitent connection.
What I did do is upgrade to the 4.3.4 firmware for the Mini. I had also 'upgraded' to the mini+ sensor. For some reason, that worked? Fan spins on start and now for 3 times after 2 restarts, the fan turns at 50C, stops at going below 50, and will start again.
So, maybe something in there is tweaking the fan setting???
I actually have the same problem like you, but my firmware ist already on 4.3.4
On reboot hotend fan is spinning ( at full power?)
When heating up, the fan starts spinning full speed from 50C to ~70C and then goes down to minimal speed. When stoping the fan by hand, its barely starting again.
Ideas?
Just did a firmware reflash. Didn't help.
Orignal fan is working.
RE:
Ugh, no… I contacted E3D directly from their website and they got back to me with in 12 hours. I’d mention all that. They will tell you that you need to recheck connections.
I think those small fans are just not ready for prime time. Maybe someone that knows the firmware can comment about why it will spin initially, but not on the call for fan/cooling. Slightly disconcerting. The damn thing is so quiet and small that it’s hard to see and impossible to hear.
I’m going to put a paint marker line on the hub so I can see if it is spinning. Paint on a blade might unbalance it.
I also don’t like that the bracket is just held on with screws with no backer nut. It will eventually work lose, plus the lower guide isn’t fully enclosed.
I’m thinking of mashing up the E3D mount, the old mount and using the old fan.
The swap tech is cool, I just think they ‘Lotus engineered’ the thing too ‘light’.
It is weird in that it runs when the unit turns on, so the wiring seems to be right- but you are right,that was my first thought, a loose or intermitent connection.
What I did do is upgrade to the 4.3.4 firmware for the Mini. I had also 'upgraded' to the mini+ sensor. For some reason, that worked? Fan spins on start and now for 3 times after 2 restarts, the fan turns at 50C, stops at going below 50, and will start again.
So, maybe something in there is tweaking the fan setting???
I actually have the same problem like you, but my firmware ist already on 4.3.4
On reboot hotend fan is spinning ( at full power?)
When heating up, the fan starts spinning full speed from 50C to ~70C and then goes down to minimal speed. When stoping the fan by hand, its barely starting again.Ideas?
Just did a firmware reflash. Didn't help.
Orignal fan is working.
RE: Revo Micro installation on my Mini+
🤣 at "Lotus engineered" I get that reference.
Mini+ (kit) - Revo Micro | Antler Cooling | WiFi (4.4.0RC1)
RE: Revo Micro installation on my Mini+
I've already designed a mount for the old fan.
I’m thinking of mashing up the E3D mount, the old mount and using the old fan.
RE: Revo Micro installation on my Mini+
I see E3d have posted a new mount that uses the original fan, it's also rather pretty.
https://www.prusaprinters.org/prints/151007-prusa-mini-upgrade-edition-2-e3d-revo-micro
RE: Revo Micro installation on my Mini+
I see E3d have posted a new mount that uses the original fan, it's also rather pretty.
https://www.prusaprinters.org/prints/151007-prusa-mini-upgrade-edition-2-e3d-revo-micro
I don’t know if I should be freaked out that I posted something and it appeared out of the ether, or hacked off that 24 hours after I install the micro, they post a revision…
RE: Revo Micro installation on my Mini+
A little of column A, a little of column B. 🙂
RE:
They actually added nuts for tighter fit too…
ETA: Is there a time frame for hardened nozzles? That’s the reason why I’ve only done one of my minis and holding off on my MK3s.
RE: Revo Micro installation on my Mini+
Im curious why they posted this. Is it possible the orignal fan is simply ineffective ? I definetly am having heat creep and clogging issues....
I see E3d have posted a new mount that uses the original fan, it's also rather pretty.
https://www.prusaprinters.org/prints/151007-prusa-mini-upgrade-edition-2-e3d-revo-micro
RE:
There's no doubt the original fan is much better, I've brushed up against the revo fan while moving some stuff and it simply stopped and didn't spin up again, I'll feel much better having a proper fan there doing the job. Although I do wish I could find a drop in replacement for the mini's hotend fan from a company like noctua.
RE: Revo Micro installation on my Mini+
I printed the V2 mount using the E3D gcode for ASA. Black Prusament ASA - 0.4mm nozzle. Fitted it in place of the original - looks OK. also took the opportunity to improve the cable runs a bit.
Once installed, tested, and re-Z calibrated, I gave it the PLA bency gcode from the original Prusa USB stick for the Mini (with the M92 command removed because of Bondtech extruder).
It actually printed a Bency, without clogging itself up - so big improvement. With the previous mount and small fan it would fail (clog and stop extruding) around deck level. I think this may be down to one or more of:
- A bigger fan moving more air over the heat break fins
- An uninterrupted left to right airflow, unlike the original fore-aft airflow, which is interrupted by the carriage mount.
- The firmware controlling the fan speed. It definitely can (see startup test) - I don't know if it does though.
The bency, although complete, did still exhibit a lot of lines on the cabin surface. It should be smooth - so there is still something not quite right.
Perhaps the cooling surface area of the Revo micro body just isn't big enough to print PLA flawlessly? Just a thought.
RE: Revo Micro installation on my Mini+
I'm having a confusing day, installed the V2 mount and loaded up some PLA to test and print quality has been dire, benchy hulls are flawless but once it gets to the bridge I get bad layers and it clogged once badly, I still haven't been able to unblock that nozzle. I have no idea what is going on here.
RE: Revo Micro installation on my Mini+
Mine looked like that and it ended up being a bad thermistor, you can check the resistance to verify (instructions above).
RE: Revo Micro installation on my Mini+
In CNC Kitchen's latest video, he actually runs a thermal couple down the filament path and his findings where that the heatbreak is actually more efficient at stopping heat creep, but that also the thermistor is most likely reading between 5 and 10C cooler than the nozzle.
His suggestion was to increase the temperature by 5-10C in the slicer to what you used for a thermistor/heatblock combination.
I've still not installed mine yet, but when I do I will definitely run mine 5-10C hotter and see how that works first.
RE: Revo Micro installation on my Mini+
I tried higher temperatures for PLA with the original mount when I was getting blockages. It made it worse, as in blocked up faster. Which is what you would expect if heat creep is happening. I also tried lowering the temperature, same result.
That said - V2 mount is an improvement - so I'm going to experiment more.
For PETG, ABS and ASA I find no issues with heat creep. These are all at 250C - 260C. Seems to me this is a PLA issue, which is odd. If there was systemic heat creep, I would assume it would happen across the board.
RE: Revo Micro installation on my Mini+
You've got me thinking now, worth the old mount I was using mainly ASA on the prints I got out of it that were good, I only put this PLA in to test the changes thinking it would be easier to identify issues. Might throw the ASA in to see how that performs later.
RE:
In CNC Kitchen's latest video, he actually runs a thermal couple down the filament path and his findings where that the heatbreak is actually more efficient at stopping heat creep, but that also the thermistor is most likely reading between 5 and 10C cooler than the nozzle.
His suggestion was to increase the temperature by 5-10C in the slicer to what you used for a thermistor/heatblock combination.
I've still not installed mine yet, but when I do I will definitely run mine 5-10C hotter and see how that works first.
I studied that video, and the finding is that the hot end over reports temperature where high flow cooling is required. In my case, this means PLA, since PETG has 30%-50% fan, and ABS and ASA have 20-30% cooling. Since the V2 mount has solved the heat creep in my case (i.e no jamming or clogging after several bency PLA prints), this now provides a working theory to look at. It also explains why PETG , ABS and ABS print perfect parts for me - the temperatures are well within the filament range - even with a small over reporting.
Across several Benchy prints I steadily increased the print temperature. Prusa Slicer started at 210C, at a 220C setting I got an absolutely perfectly smooth hull. I conclude that, as Stefan found, this means my hot end is over reporting at the upper end of 5C-10C when being cooled by the print fan.
However, the small pillars in the cabin consistently had bad lines and ridges. According to what I can find on the internet, these artefacts are the product of bad cooling.
Looking at what has changed from stock hot end to Revo hotend, the obvious thing is the diameter of the Revo nuzzle is much larger than the stock nozzle. This leads me to a working theory that I will test over the next few days: That the Revo nozzle is diverting the cooling airflow away from the very tip of the nozzle. Hence the poor cooling only shows up on parts where all the surface area is within the nozzle diameter, like the benchy cabin pillars.
As a lash up test for the theory I intend to print a benchy with the nozzle sleeve removed. This will no doubt make the nozzle over report the heat even more - so it may take a few goes to see if this makes a difference. Also, the diameter reduction does not get back to original nozzle size - so possibly a waste of time.
Second line attack will be to find an alternative cooling duct design that circumvents the new nozzle size. This will take me longer.
It would be interesting to hear if any of the guys with esoteric cooling duct designs have solved this PLA cooling issue on the benchy.
RE: Revo Micro installation on my Mini+
This all makes a lot of sense, regarding alternate duct designs I did try This antler duct and while the design seems sound I found the antlers extended too far down which caused issues with anything that could curl even slightly, I also didn't like that is completely removes the rear cooling. There are some old alternate ducts for v6 that had nice wider cooling ducts and a small amount of rear cooling which I feel would be ideal.