Prusa3D Forum - Recent Topics https://forum.prusa3d.com/forum/ Prusa3D Forum Discussion Board en-US Fri, 17 Apr 2026 19:33:04 +0000 wpForo 60 Extrusion multiplier seems to be ignored https://forum.prusa3d.com/forum/prusaslicer/extrusion-multiplier-seems-to-be-ignored/ Fri, 17 Apr 2026 19:05:42 +0000 I've found by trial-and-error that a flow rate of 60% is working best with my Prusa CoreOne+ using ColorFab LW-PLA filament, but when I set Extrusion multiplier in the PrusaSlicer Filaments menu tab to 0.6 it usually seems to be ignored, so I have to set it to 0.6 in my CoreOne's screen after starting the print.  Even then, if I set it too early, such as when the nozzle temperature is still ramping up, it reverts back to 1 and I have to quickly re-set it to 0.6 while the brim is printing.

Any idea what I might be doing wrong when slicing?  All other parameters I set in PrusaSlicer, such as nozzle temperature, are okay.

]]> abenn https://forum.prusa3d.com/forum/prusaslicer/extrusion-multiplier-seems-to-be-ignored/ Very occasionally: no print whatsoever (SL1S) https://forum.prusa3d.com/forum/original-prusa-sl1-hardware-firmware-and-software-help/very-occasionally-no-print-whatsoever-sl1s/ Fri, 17 Apr 2026 14:29:54 +0000 I've had this happen twice now with my SL1S (upgraded from an SL1 a few months ago): everything appears normal but, when the print completes, there is no print.  Nothing whatsoever has solidified, either on the print plate or in the reservoir or on the film, absolutely nothing, I have a reservoir of liquid resin and a damp print plate, that is it.   It is like as if the UV light never came on; no alarms, nothing untoward, just no solidified resin.  Run the print again, no movement of anything, and the print is fine and dandy.

According to the system log I have done 282 prints (I'm assuming the count is since upgrading) and this has happened twice.  When it happened today it was on an occasion when I had not quite put enough resin in the reservoir: I had cancelled the print job and then pressed reprint after filling the reservoir up properly.  I can't say whether the previous occasion when this happened was under the same set of circumstances, since this occurs relatively rarely (I was just finishing off a bottle).

It feels to me like a FW bug (I am on FW 1.8.0).

Has anyone else experienced this?

]]> Rob Meades https://forum.prusa3d.com/forum/original-prusa-sl1-hardware-firmware-and-software-help/very-occasionally-no-print-whatsoever-sl1s/ Filament Change with MMU3 takes five minutes https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-hardware-firmware-and-software-help/filament-change-with-mmu3-takes-five-minutes/ Fri, 17 Apr 2026 12:09:50 +0000 Normal wipe tower operation up until the point where it should retract the filament. At that point it just cycles back and forth like it is wiping, but no filament is extruded. After about five minutes of this, it retracts the filament and makes the change. Next filament change results in the same cycle.

All kind of funny when I got an email telling me how fast the new firmware would change filaments.

Filament: PCTG - 3D Fuel

When I get a chance, I'll try the same model with PLA to see if that is connected. 

]]> barney15e https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4s-hardware-firmware-and-software-help/filament-change-with-mmu3-takes-five-minutes/ Clicking noise coming from extruder unable to print https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/clicking-noise-coming-from-extruder-unable-to-print-2/ Fri, 17 Apr 2026 01:23:39 +0000 Clicking noise coming from extruder. This started about 3 weeks ago, I have not been able to print. I've had this CORE ONE for about 5 months. The noise was very noticeable. I disassemble the extruder, cleaned the gears and put it back in place. I tuned the belt and recalibrate everything. The sound got somewhat better but it is still not printing right. Not sure if is the motor the nozzle ( which I also cleaned many times).

]]> 37VI5 https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/clicking-noise-coming-from-extruder-unable-to-print-2/ Clicking noise coming from extruder unable to print https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/clicking-noise-coming-from-extruder-unable-to-print/ Fri, 17 Apr 2026 01:22:59 +0000 Clicking noise coming from extruder. This started about 3 weeks ago, I have not been able to print. I've had this CORE ONE for about 5 months. The noise was very noticeable. I disassemble the extruder, cleaned the gears and put it back in place. I tuned the belt and recalibrate everything. The sound got somewhat better but it is still not printing right. Not sure if is the motor the nozzle ( which I also cleaned many times).

]]> 37VI5 https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/clicking-noise-coming-from-extruder-unable-to-print/ Extruder crashing on wipe tower after firmware update https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-on-wipe-tower-after-firmware-update/ Thu, 16 Apr 2026 20:32:52 +0000 Extruder crashing into wipe tower after update

 

I've just updated to the "new" firmware, and on my first print I had the layers shift.  This happened three times.  The culprit is the wipe tower.  For some reason, large blobs of filament are deposited into the wipe tower on filament change.  Eventually, the buildup will cause the extruder to drag and the motors will skip steps.

This is happening on my CoreOne+.  I've got the Coreboxx on top with active smart rewinders by @mire.

I've tried adjusting settings on the wipe tower, and it makes no difference.  Eventually the extruder crashes and ruins the print.  I've tried this print three times now.

]]> Steve https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-on-wipe-tower-after-firmware-update/ Extruder crashing into wipe tower after update https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-into-wipe-tower-after-update/ Thu, 16 Apr 2026 19:54:43 +0000 ]]> Steve https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-into-wipe-tower-after-update/ Extruder crashing on wipe tower https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-on-wipe-tower-2/ Thu, 16 Apr 2026 19:48:20 +0000 ]]> Steve https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-on-wipe-tower-2/ Extruder crashing on wipe tower https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-on-wipe-tower/ Thu, 16 Apr 2026 19:46:22 +0000 ]]> Steve https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-hardware-firmware-and-software-help/extruder-crashing-on-wipe-tower/