I got a new Bamboo labs A1 and it has under extrusion first layer. I tried different filaments and flow rate and dynamics calibration. I also tried flipping the build plate and same issue.
I am using the textured build plate. I tried three different filaments. I tried with flow calibration on and off. I tried moving the print. All the same issue. Sometimes the spot of under extrusion is larger and sometimes its smaller.
It could be a Z offset/ bed level issue more than an extrusion problem - I don’t know if there is any way to change Z offset but you could try putting a piece of aluminium foil between the bed and the plate to see if there is any difference.
Areas of the print are perfect, and areas are not, The Z offset seams to be correct from the ABL. Sometimes its larger and sometimes its smaller. I cleaned the bed same issues.
just a quick question, as it wasn’t mentioned yet, but are you using the hardened Steel Hotend, or the Stainless Steel Hotend?
The Hardened Steel has noticeable Z-offset issues and can cause a similar problem.
You actually nailed the topic on the head. I am having issues with the noticeable offset between hardened and stainless steel hotends. Swapping between the two is causing quite a bit of issues with print quality for me with the hotend being far too low.
I tried again and almost the entire print is really bad. Only some areas are good and most of it is separated. I am using a full bed single layer print to test.
Most of the first layer is completely separated. This is a brand new printer out of the box. I have a smooth sheet and a hardened steel nozzle coming soon.
Seems like a bit of dumb question but have you tried calibrating your filament yet?
Yes, same result. Did the full calibration. Flow Dynamics and Rate. I have tried 4 different filament manufactures.
Which flow values did you select and do you have pictures of the samples? Also have you printed a temp tower to see what the optimal printing temperature of each filament is? Under optimum nozzle temperature can cause flow issues.
I choose the smoothest flow values. It was .04 for k value and +5 +0. It’s happening across multiple PLA brands. If it was a temp issue, then it should be bad across the entire print but in this case some of the print 100% perfect and only area’s or spots are under extruded.
Does running the printer in Silent mode have an affect on the print?
With Factor K .35 Flow Ratio 1.35 Slow speed 50%. Reduced the under extrusion, it is now just smaller but still there. Flow ratio is probably helping but it’s too much the filament is bunching up on the sides. I’m going to step it down. Stepping down the temp slowly to test if the flow is better.
Still in the same general area left of center.
Flow 1.25 K 1.35 Always in the same spot. 80% of the print is flawless. I’ll have a hardened steel nozzle and a smooth print bed to test tomorrow. It’s strange because the flow dynamics are fine for 80% of the print. But why in this one area is it bad. The ABL not correcting for a dip in the bed? ABL should be able to correct! Also, why in the same areas? The tubes are not kinking or anything.
I’m using stock stainless nozzle with stock texture bed. Tomorrow I will have the Hardened and smooth bed to test.
My guess is that area is contaminated. Looks just like this.
https://wiki.bambulab.com/en/filament-acc/acc/pei-plate-clean-guide
I cleaned it thoroughly with dish soap and hot water first fix. I don’t touch the bed with my fingers only the edge of the plate. On prints just hitting reprint with different settings can give different results without touching the bed. It feels like a mechanical problem that software can temp make better like adjusting flow rate.
