Print fan calibration fails
Hi All,
1 week ago I received my MK4S kit and started the build during the weekend. All looks very nice and the difference between the MK3S (my previous printer) and the MK4S are a big improvement. Although some of them are just - but a lot of - (small) details in the design. The big changes are in the printhead and electronics.
After assembly I started the 1st calibration - fan calibration. Unfortunately this one failed directly. The print fan reaches only 4800rpm but required a higher speed.
I tried (after updating the firmware to version 6.1.3):
- checking the cable loom
-checking the "love baord"
- multiple repeats of the calibration (with multiple I mean at least 50x) with mounted fan
- multiple factory resets (complete and calibration only - at least 10x) with mounted fan
- repeated the calibration and factory reset with dismounted fan
Contacting (the disappointing) support from Prusa directly --> no results, no action, no spare parts send until today (4 days later) and still unable to use a new printer. Even after the request to send a new fan and love board (on my own expenses), no reaction/action anymore.
So I continued my tests:
- very small test print of enclosure cover (1 pcs) in PLA -- > works
- very small test print of enclosure cover (1 pcs) in ASA -- > fails due to fan
Therefore I reach out to this forum. Has anyone experienced the same issue? Did you find a solution? Please let me know.
Thanks a lot in advance.
Fan works, only not reaches max. required RPM 
Successful calibration of all other parts 
Also with fan housing removed, no improvements 
Test print ASA fails, due to print fan
RE: Print fan calibration fails
Do you have the printer type in Settings -> Hardware set to MK4S? Just spit-balling here, but since the MK4 fan is different than the MK4S fan and the xBuddy board might default to MK4... I might be way off, but it's an easy check.
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs
RE: Print fan calibration fails
Hi Sembazuru,
Do you mean in the Prusa Slicer? Yes, I added the MK4S specifically. If there is an other place to adjust, I have not done that and if that is the case, could you please let me know where I have to change this setting?
Thanks for your reply!
RE: Print fan calibration fails
All the instructions are here: https://help.prusa3d.com/guide/6-preflight-check_754328
Specifically step 4, under settings -> hardware set printer type to MK4S.
RE: Print fan calibration fails
For me it was the case that the fan did not pass the test when installed. When I hold the fan in my hand and do the test it passes. I did that and then reinstalled it.
RE: Print fan calibration fails
Hi Jetro,
Thanks for the information, but that setting I checked at initial startup and is correct set to "MK4S". Unfortunately, not the solution to this issue.
RE: Print fan calibration fails
Hi Jetro,
Thanks for the information, but that setting I checked at initial startup and is correct set to "MK4S". Unfortunately, not the solution to this issue.
Yeah, that was the setting that I was talking about. Sorry it didn't solve your issue.
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs
RE: Print fan calibration fails
Hi There,
After receiving the new fan, everything works fine. So it was a hardware issue.
Cheers!