Prusa3D Forum - Recent Topics

help with extrusion multipiler calibration

evolutio — Thu, 16 Apr 2026 09:55:28 +0000

hey guys,

I need help with the calibration of the extrusion multipiler (https://help.prusa3d.com/article/extrusion-multiplier-calibration_2257)

Since this sheet has in some areas a lot of space between the lines, it looks like underextrusion, espacially near the holes. The sheet was printed with "DasFilament" (https://www.dasfilament.de/filament-spulen/pla-1-75-mm/683/pla-filament-1-75-mm-toms3d-infinity-blue-1-kg?c=11) with extrusion multipiler: 1

After reading https://help.prusa3d.com/article/extrusion-multiplier-calibration_2257 I tried it with the visual method

I tried a few prints, but I'm not sure if it get's worse or better:

extrusion multipiler 1:

extrusion multipiler 1,05:

extrusion multipiler 1,1:

extrusion multipiler 1,2:

with holes:

I'm a bit concerned why the sheet has the space between some lines and the cube not, maybe someone can help me.

Currently I print the cube to test it with the caliper tool.

Will there be a INDX version of the CORE One+?

efvee — Thu, 16 Apr 2026 09:22:26 +0000

As I understand the INDX comes as an update for the CORE One+. This I understand means buying a Core One+ with a Nextruder and then take out the Nextruder and the filament guide to install the INDX, leaving the Nextruder in a drawer gathering dust.

I'd prefer, I think, having a CORE One+ with the INDX stuff natively built in, or a bare Core One+ without Nextruder.

PrusaSlicer Full Spectrum

hyiger — Thu, 16 Apr 2026 04:57:44 +0000

This is a port of Orca Slicer CMYK Full Spectrum color mixing. It's a first version alpha. It's a work in progress. Please give it a try. I don't have a multicolor setup on my core one.

https://github.com/hyiger/PrusaSlicer/releases/tag/v0.1.0-virtual-filaments

Virtual Filaments Tutorial

Virtual filaments create mixed colors by alternating physical filaments layer-by-layer. A region painted with "Virtual T1+T2" prints with filament 1 on even layers and filament 2 on odd layers, producing a blended color appearance.

Setup

1. Printer with multiple extruders

Select a printer profile with 2 or more extruders (e.g., Prusa CORE One with MMU3, or any multi-extruder printer).

2. Load filaments

Assign filament presets to each extruder slot in the sidebar. Choose colors with good contrast for visible blending:

Slot	Example	Color
T1	PLA Cyan	#21FFFF
T2	PLA Magenta	#FB02FF
T3	PLA Yellow	#FFFF0A
T4	PLA Black	#000000

3. Enable virtual filaments

Go to Print Settings tab
Select Multiple Extruders in the left tree
Find the Virtual Filaments section
Check Enable virtual filaments

The sidebar will show a Virtual Filaments panel listing all auto-generated pairs with blended color previews:

T1 + T2 (50%)   
T1 + T3 (50%)   
T1 + T4 (50%)   
T2 + T3 (50%)   
T2 + T4 (50%)   
T3 + T4 (50%)

Use the checkboxes to enable or disable individual virtual filaments.

Painting

1. Open the MMU painting gizmo

Click the paint brush icon in the left toolbar, or press N.

2. Select a virtual filament color

In the First color dropdown, scroll past the physical extruders to find virtual filament entries:

Extruder 1 (physical)
Extruder 2 (physical)
...
Virtual T1+T2
Virtual T1+T3
Virtual T2+T3
...

Select a virtual filament as your painting color.

3. Paint faces

Left mouse button: Paint with first color
Right mouse button: Paint with second color
Shift + Left mouse button: Remove painted color
Alt + Mouse wheel: Change brush size

Use Smart fill or Bucket fill tool types for faster coverage of large areas.

4. Slice

Click Slice now. In the G-code preview:

Each layer shows the physical extruder color that the virtual filament resolves to on that layer
Scrub through layers with the right-side slider to see the alternation
The legend shows physical extruder colors (the actual filaments being used)

Settings

Found in Print Settings > Multiple Extruders > Virtual Filaments:

Setting	Description
Enable virtual filaments	Master toggle. When off, virtual filaments are hidden and ignored during slicing.
Advanced dithering	Uses ordered dithering instead of contiguous layer runs for more even color distribution. Only applies to custom virtual filaments.
Collapse same-color regions	Merges adjacent painted regions that resolve to the same physical filament on a given layer, reducing unnecessary tool changes.

How it works

Layer alternation

A virtual filament with a 1:1 ratio (50% blend) alternates every layer:

Layer 0: ████ Filament A (cyan)
Layer 1: ████ Filament B (magenta)
Layer 2: ████ Filament A (cyan)
Layer 3: ████ Filament B (magenta)

From a distance, the eye blends these into a mixed color (purple).

Color blending preview

The sidebar and painting gizmo show perceptual pigment-style blended colors. This model produces realistic mixing predictions:

Blue + Yellow = Green (not gray like RGB averaging)
Red + Yellow = Orange
Red + Blue = Purple
Cyan + Magenta = Blue

Wipe tower

Virtual filament regions create additional tool changes compared to single-material printing. The wipe tower accommodates these automatically. Each layer-to-layer alternation is a physical tool change that requires purging.

Tips

Start with two filaments to understand the behavior before using more complex combinations.
Use high-contrast colors (e.g., cyan + magenta) for clearly visible results.
Check the G-code preview layer-by-layer using the slider on the right side. You should see the painted regions alternate between the two component colors.
Thin walls and small features may not show the blending effect well since they have fewer layers.
Print speed: Virtual filaments don't change print speed, but the additional tool changes add time. Check the estimated print time before committing to a long print.

Limitations

Virtual filaments can only be applied by painting faces in the MMU gizmo. They cannot yet be assigned as the default extruder for a whole object.
Advanced features from OrcaSlicer-FullSpectrum (height-weighted cadence, 3+ color gradients, per-perimeter patterns, same-layer pointillisme, surface bias offsets) are not yet implemented.
Maximum of 15 total colors (physical + virtual) due to the triangle selector's state encoding limit.

Spare MK4S build plates, can I use on Core One L?

JMERS — Thu, 16 Apr 2026 02:40:27 +0000

I am considering a Core One L and have MK4S with extra build plates. Obviously, I can't use the full XY build volume and I'm thinking an adapter would be needed to align the smaller plate, but theoretically, if the MK4S plate was positioned where the nozzle checks for the plate, it could work if I kept the model constrained in the xy dimensions in the slicer? Oh wait, then there is bed leveling... hmmm

Printing with 0.25 nozzle--Printer preset dependency and any other tips?

GregorH — Wed, 15 Apr 2026 23:30:49 +0000

I have a need to print a small intricate part (about 20x10x15 mm) and thought it would be better to use a 0.25 nozzle. Ordered one from Printed Solid, arrives tomorrow.

Edited a copy of the 0.20 BALANCED Print Settings to use 0.10 height layers (after 1st), and then edited the HF0.4 printer setting to change it to 0.25 nozzle and non-HF. Returning to the plater tab, the new 0.10 BALANCED print settings are not in the dropdown. Looking further, found the settings say they are dependent on the HF0.4 printer setting. Question: Why are they dependent? This dependency is easy to remove, but I don't want to discover there was another dependency beyond the HF0.4 nozzle that causes a print failure. I'd appreciate any insights anyone has.

Any other tips or settings I should be aware of using a 0.25 nozzle? Plan to use PCTG filament.

Thanks in Advance!

Panchroma Luminous PLA Tips

James W7TXT — Wed, 15 Apr 2026 19:37:47 +0000

Thought this might be useful for others. I've had success printing Luminous PLA (glows in the dark after exposure to light, especially UV). On a Core One+, I stared with the generic PLA profile and adjusted the following after looking at profiles for other printers & the data sheet:

First layer: 225
Other layers: 220
Abrasive material
Retraction length: 1 mm
Retraction speed: 20 mm/s

You must print this with a hardened nozzle!

OctoPrint wireless LCD control MK3S

WilliamL — Wed, 15 Apr 2026 19:32:36 +0000

I often encounter an issue where I want to send my GCode through OctoEverywhere/OctoPrint when I am not near my MK3S, but it does not allow me to do so because I need to click confirm for an error or a message on the printer's LCD. Is there any way, through an addon or a setting that I didn't see in OctoPrint, to display on OctoPrint what is shown on the LCD and control it as if i am moving the knob in-person?

In other words, I want to navigate in my printer's LCD with my computer, not the physical knob.

Thanks!

First Layer Calibration has Jagged edges

Fabiola Ar — Wed, 15 Apr 2026 15:00:21 +0000

Hello, I have been trying to calibrate my printer with the wizard but on the first layer calibration the print cones out with jagged edges like this one. It used to work fine. I did move the printer to a different table recently and noticed it started doing this so I moved it back to the table I used to print on but something seems to have moved. Now when i calibrate the printer the first layer keeps coming out with jagged uneven edges like this. Its supposed to look symmetrical.

Any ideas as to what I can do to fix it?

Thanks in advance.

Minitemp #12207

U. W. — Wed, 15 Apr 2026 12:24:06 +0000

Hallo,

an meinem Mini+ trat jetzt schon mehrmals o.g. Fehler auf. Ich habe daraufhin die Fehlersuche per Leitfaden durchgeführt. Nach dem Zusammenbau lief der Drucker wieder für ein paar Tage. Nun trag der Fehler wieder auf. Und zwar unmittelbar nach der ersten Schicht. Könnte das der Thermistor sein? Ich habe mal vorsorglich einen neuen Thermistor und die Anschlusskabel zur Heizbettheizung bestellt und werde diese austauschen. Wird damit der Fehler behoben sein oder muss ich noch an anderen Stellen suchen?

Danke