[Solved] persistent adhesion issue on my Prusa Core One  

RE: persistent adhesion issue on my Prusa Core One

solved

RE: persistent adhesion issue on my Prusa Core One

Posted by: @artnow

solved

For the sake of others who may have a similar issue in the future, could you elaborate on how you solved it? 

RE: persistent adhesion issue on my Prusa Core One

I can only speak about my own ABS observations. To me, the main challenge is that the material contracts, about 0.4 % per the "calibrated" XY correction factor that gives correct final dimensions.

In my printer, the front right edge - that is where the door closes - is the most sensitive: For large, flat prints, this corner detaches first.

An example, below (I'm throwing LEGO problems at the poor printer just for laughs and the learning experience. This one was, if I remember correctly, without brims and support, which will also trigger warnings from Prusa Slicer. Printing time probably around 8h).

RE: persistent adhesion issue on my Prusa Core One

Hello, here are the settings I made to get my print working

I’m also attaching the configuration file. Have a great day!

General Information

Profile and Printer– print_settings_id: 0.20mm BALANCED @COREONE HF0.4 – last IA– printer_model: COREONE with 0.4 mm high-flow nozzle– filament_type: Generic ABS @COREONE HF0.4

Layer and Height Settings

layer_height: 0.20 mm (balanced quality and speed)

first_layer_height: 0.20 mm

min_layer_height: 0.07 mm / max_layer_height: 0.30 mm

bottom_solid_layers: 3 layers

top_solid_layers: 5 layers

bottom_solid_min_thickness: 0.50 mm

top_solid_min_thickness: 0.70 mm

Temperatures

first_layer_temperature: 258 °C

temperature (subsequent layers): 255 °C

idle_temperature: 140 °C

first_layer_bed_temperature: 120 °C

bed_temperature (subsequent): 115 °C

chamber_minimal_temperature: 20 °C

Print Speeds

first_layer_speed: 45 mm/s

perimeter_speed: 150 mm/s

external_perimeter_speed: 200 mm/s

small_perimeter_speed: 170 mm/s

infill_speed: 150 mm/s

solid_infill_speed: 150 mm/s

top_solid_infill_speed: 100 mm/s

travel_speed: 350 mm/s

bridge_speed: 50 mm/s

Accelerations

default_acceleration: 3000 mm/s²

first_layer_acceleration: 500 mm/s²

perimeter_acceleration: 3000 mm/s²

external_perimeter_acceleration: 2500 mm/s²

infill_acceleration: 5000 mm/s²

solid_infill_acceleration: 5000 mm/s²

top_solid_infill_acceleration: 2000 mm/s²

bridge_acceleration: 1500 mm/s²

travel_acceleration: 7000 mm/s²

Dynamic acceleration reduction by height (via before_layer_gcode):– 0–150 mm: 7000 mm/s²– 200 mm: 4000 mm/s²– 270 mm: 2000 mm/s²

Extrusion Widths

extrusion_width: 0.45 mm

first_layer_extrusion_width: 0.50 mm

perimeter_extrusion_width: 0.45 mm

external_perimeter_extrusion_width: 0.45 mm

infill_extrusion_width: 0.45 mm

solid_infill_extrusion_width: 0.45 mm

top_infill_extrusion_width: 0.42 mm

Infill

fill_density: 15%

fill_pattern: grid

fill_angle: 45°

infill_overlap: 15%

bottom_fill_pattern: monotonic

top_fill_pattern: monotoniclines

Perimeters and Shell

perimeters: 2

perimeter_generator: arachne

ensure_vertical_shell_thickness: on

external_perimeters_first: off

Retraction

retract_length: 0.70 mm

retract_speed: 45 mm/s

deretract_speed: 25 mm/s

retract_before_travel: 1.50 mm

retract_lift (Z-hop): 0.20 mm up to Z=269 mm

retract_before_wipe: 80%

Cooling

min_fan_speed: 0%

max_fan_speed: 0%

bridge_fan_speed: 0%

disable_fan_first_layers: 5

(No part cooling fan for ABS to avoid warping.)

Supports

support_material: on

support_material_auto: on

support_material_threshold: 35°

support_material_pattern: rectilinear

support_material_spacing: 2 mm

support_material_contact_distance: 0.20 mm

support_material_interface_layers: 3

support_material_style: snug

Brim

brim_width: 8 mm

brim_type: outer_only

skirts: 0

Dimensional Compensation

elephant_foot_compensation: 0.20 mm

xy_size_compensation: 0 mm

z_offset: 0 mm

Pressure Advance / Linear Advance

In start G-code, pressure advance is set per nozzle size:

0.4 mm nozzle: M572 S0.02

0.5 mm nozzle: S0.018

0.6 mm nozzle: S0.015

0.8 mm nozzle: S0.01

Custom G-Code

Start filament G-code– 7 mm purge, wipe on bed edge, 0.5 mm retraction to avoid blobs.

End filament G-code– Turn off temperatures, lower bed to Z=180 mm, park head at X220 Y200, disable motors.

RE: persistent adhesion issue on my Prusa Core One

my GCODE : 

; === Dynamic pressure and heatbreak settings by nozzle ===M572 S{if nozzle_diameter[filament_extruder_id]==0.4}0.02{elsif nozzle_diameter[filament_extruder_id]==0.5}0.018{elsif nozzle_diameter[filament_extruder_id]==0.6}0.015{elsif nozzle_diameter[filament_extruder_id]==0.8}0.01{elsif nozzle_diameter[filament_extruder_id]==0.25}0.09{elsif nozzle_diameter[filament_extruder_id]==0.3}0.065{else}0{endif} ; Filament g-codeM142 S40 ; set heatbreak target temperature

; === Anti-residue filament start sequence ===G92 E0 ; Reset extruder positionG1 Z0.3 F1000 ; Slightly raise the nozzleG1 X5 Y5 F3000 ; Move the head to a cornerG1 E7 F400 ; Purge 7 mm of filament to primeG1 X60 F1200 ; Wipe the filament tip on the bed edgeG1 E-0.5 F1800 ; Light retraction to avoid a filament blobG92 E0 ; Reset extruder again

; === Print start ===

RE: persistent adhesion issue on my Prusa Core One

For what it's worth, Prusa's material guide states that glue stick must be used when printing ABS on the textured build plate:
https://help.prusa3d.com/filament-material-guide

RE: persistent adhesion issue on my Prusa Core One

Hello, I now have good printing results, no need for glue stick, I would never use such a process, with the right settings, the results are excellent, I also avoided several failures by monitoring the start of the leveling tests and the start of printing by removing a small filament droppings under the printing nozzle which was distorting the good gluing of the border around the part. To put it simply: When the nozzle is clean from the beginning to the end of the steps, the parameters are well adjusted and the first layer is well adjusted with the right températures corresponding to the type and recommendations of the manufacturer, then the printing is great!

RE:

What's wrong with glue stick? It's a very robust process, layer thickness matters little as the print "floats" on the PVA, regardless how thick it is.

Meaning, "robust" compared to cleaning, where "residual dirt" is hard to control: Overdo the cleaning, and prints get very hard to remove (especially thin layers - very annoying when having to abort a print, thinking about wipe towers rendered for super. strong. adhesion...).

RE: persistent adhesion issue on my Prusa Core One

Hello mnentwig,

Thank you for this pertinent observation! You're right about the robustness of the PVA process, but you're pointing out exactly the problem I've solved: it's not just about cleaning, it's a globally parameterized approach.

My results come from a precise combination of critical settings:

1. Cooling Fan — THE fundamental parameter

First layer : cooling fan 0% or very low (5-10% max) — otherwise too rapid cooling = delamination and poor adhesion

Following layers : progressive increase to 80-100% depending on the filament

This was my first bottleneck. Poorly tuned cooling ruins both adhesion AND quality

2. First layer height — The critical adjustment

Nozzle offset: ±0.05mm max precision

Too high = filament won't stick / Too low = crushing and impossible to remove

Manual verification: the filament should leave a very slight black trace under the nozzle

3. Adapted thermal profiles — THE often-forgotten key

First layer : 263°C nozzle / 115°C bed (ABS with your configuration)

Layers 2-3 : progressive decrease to 260°C nozzle / 110°C bed

Following layers : stabilization at 255-258°C nozzle / 105°C bed

First layer 20-30°C hotter than the rest = adhesion without overheating afterwards

Regarding the glue stick:

You may very well be right about its effectiveness, but honestly I found this solution limited. Sure, Prusa documents it officially, but the bed ends up clogged with dried glue, which ironically deteriorates adhesion for subsequent prints.

On my end, I simply wipe the bed with isopropyl alcohol every 2-3 prints to keep the PVA clean — it's infinitely simpler and more effective than regular glue maintenance.

With the right parameterized configuration, this simple cleaning is enough. Prints stick properly and remove easily without this vicious cycle of glue accumulation.

Proof in action: since this optimization, I've completed around fifteen beautiful ABS and PLA prints without any adhesion issues. It's really stable and reliable now.

I believe your negative experience with cleaning was probably masked by a poorly calibrated first layer or suboptimal cooling settings. With the right overall configuration, it's a reliable and clean process.

Best regards,ARTNOW

RE: persistent adhesion issue on my Prusa Core One

Thanks for the feedback. I'm sure glue stick is not necessary - many people never touch it. 

Still, I'd argue it's attractive for its robustness, you get a fresh layer every time.

BTW, "PVA" = polyvinyl alcohole. That's the standard-issue glue stick (there is one alternative substance, depending on brand that is not "exactly" PVA but reportedly acts just the same).