Hi all,
Does anyone have a clue on what is causing this?
The raft is perfect but the print itself is a huge fail…
It is abs print (220°C hotend, 90°C bed) in a flashforge creator pro.
Are you doing any retraction? It looks like you’re seeping filament during movements so be sure to do something like 2-3mm’ish of retraction. You can also experiment with temp and lower it by 5’ish to slow the flow rate, but I’d start with retraction.
Looks like under extruding for starters. Have you checked your esteps on your extruder? What are you using to adhere the print? I usually print ABS at much higher temps 238c with a bed temp of 110 for first layer and 100 for all others. Also check your filament diameter and make sure it matches the software.
???
Under extrusion? Most slicers will increase the Z height slightly between the top of the raft/support and the bottom of the actual print so that the raft/support is easier to remove. Looks like yours might not have adhered well to the raft and pulled away ending up a blob stuck to the nozzle.
@Tim_Sills I use 1mm retractation, I’ll try to increase it.
@Sean_B I used 220° because that what is written on the spool but I’ll try higher. For the bed I did a test at 110° and it seems to have better adherence. I tried blue tape and blue tape with glue, but the with glue it was worth… Tomorrow I’ll try with abs juice. Just wondering if I should put the juice in top of the blue tape or if I should remove it…
Actually I used the raft because the first layer want adhering enough but I think I should not use it and fix the adherence issue.
I hope abs juice+temperature tweaking will help…
Take a look at the gcode view. Step through the layers. When I was trying to print a nice thick first layer, the effect was sort of like what you have here. I dialed it back till the view looked good. Fixed my issue.
It could be that you have too high of a z gap between the raft and the print. Don’t print with a raft and see if it is ok just printing directly on the bed
Finally I ended up replacing the blue tape by Kapton, re-leveling the bed, adjusted temperature to 230° and 110° for the bed, added 2mm retractation, reduced the speed to 4000m/s and… Successfully printed!
@Benjamin_Santalucia great! Be careful with retraction if you have any slop on your z leadscrews, or preload them with some springs.