Under extrusion? at start of seam - Hardware, firmware and software help https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/ Prusa3D Forum Discussion Board en-US Sun, 08 Mar 2026 01:06:17 +0000 wpForo 60 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-778698 Sun, 18 Jan 2026 21:00:19 +0000 Thank you for all the advice. I will certainly try another cold pull.

At this stage I am thinking of taking a small gamble and replacing wear components related to the filament: Nozzle and all PTFE tubing after the extruder. I would probably avoid replacing the extruder itself. Can you think of any other 'consumable' items?

 

]]> Hardware, firmware and software help Matt https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-778698 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-778296 Thu, 15 Jan 2026 20:08:57 +0000 If you suspect blockage then try cold pulls or try with another clean nozzle?

]]> Hardware, firmware and software help _KaszpiR_ https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-778296 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-778153 Wed, 14 Jan 2026 21:14:33 +0000 I already had a go at making minor adjustments to the detraction setting. Increasing his helped to improve the cosmetics. I did this in small incremental steps just until the flaws disappeared. The problem is that this resulted in excess filament being deposited on the other side of the print and the nozzle knocked it off each time. Adjusting the setting almost seems like applying Band Aid bandage, rather than resolving the cause- could the problem be a blockage? - I can't see one. 

The problem even occurs without Input Shaping.

 

 

 

 

]]> Hardware, firmware and software help Matt https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-778153 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-777767 Mon, 12 Jan 2026 08:58:24 +0000 Input Shaping tuning or retraction tuning would be next tests

]]> Hardware, firmware and software help _KaszpiR_ https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-777767 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-777734 Sun, 11 Jan 2026 20:48:07 +0000 I have tried the Prusament profile... no luck- the issue persists. Do have any further thoughts?

]]> Hardware, firmware and software help Matt https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-777734 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-777067 Wed, 07 Jan 2026 21:29:20 +0000 Hello,

I will certainly try changing the filament profile to Prusament PLA as suggested. Will test at the weekend. The uneven extrusions do seem to appear on the inner star elements. Thanks for your ideas.

Matthew

 

]]> Hardware, firmware and software help Matt https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-777067 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776878 Tue, 06 Jan 2026 13:22:34 +0000 Try switching to Prusament PLA @MINIIS, I glanced at the ESUN  filament profile and it has some custom gcode on start that changes PA setting, and this may cause issues.

Do you get those uneven extrusions in other parts of the print? (other seams in internal star elements)

]]> Hardware, firmware and software help _KaszpiR_ https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776878 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776796 Mon, 05 Jan 2026 20:39:36 +0000 Hello,

Thank you for interest in my printing problem. This is causing me quite a bother. I am normally quite good at solving issues like this. In this case, I need expert advice.

I have checked the PTFE tube between the extruder and hotend. I do not see any physical damage or wear. Could I be looking for something else here?

The star is positioned flat on the bed and the seam joint is positioned towards the upright support column of the Prusa Mini (RHS when viewed from the front)

Here is the zipped 3mf file as requested.

fidget_star_8_8

Kind regards

Matthew

]]> Hardware, firmware and software help Matt https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776796 RE: Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776688 Mon, 05 Jan 2026 08:03:31 +0000 Check the ptfe tube between the extruder and the hotend ( the long one).

Can you provide more details about the model orientation on the bed, where the seam is located? Or maybe you could share 3mf file as zip?

]]> Hardware, firmware and software help _KaszpiR_ https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776688 Under extrusion? at start of seam https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776650 Sun, 04 Jan 2026 20:40:25 +0000 I recently tried printing some PLA fidget stars with my Prusa Mini+. Several years ago I had no issues when printing the design. Recent efforts show what appears like under extrusion at the start of each seam (see pictures below). I contacted Prusa support and have already ruled out issues with:

-The type, age and condition of the filament

-The hotend PFTE tube (I have replaced this with no improvement)

-Extruder spring tension

-Cleanliness of the extruder mechanism (now clean)

-Cleanliness of the hotend (no blockage)

- Firmware and Prusaslicer fully updated

As suggested by Prusa, I tried tweaking the de-retraction setting. This helped at the seam, but then pushed out so much filament that prints were colliding with the nozzle. Prints were knocked off every time.

The machine has only seen hobby use. The problem continues. Do any Mini+ users have a potential solution?

 

 

]]> Hardware, firmware and software help Matt https://forum.prusa3d.com/forum/hardware-firmware-and-software-help/under-extrusion-at-start-of-seam/#post-776650