Strange lumpiness after print is about 1cm high

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Strange lumpiness after print is about 1cm high

Post by davies46 »

I have a home-made Prusa 2 which has been printing fine for years. I recently dusted it off and since it was in an unknown state I reflashed it with the latest Marlin. The electronics is RAMPS 1.4 and all seems fine. I printed out thin wall and 50mm cube no problems (3mm ABS), but when I print larger pieces it starts getting very lumpy after around 12mm height. Specifically it shows on some wall sides but not others. I have tried printing with plenty layer cooling fan and no fan, different bed heating, cool ABS and hot ABS, I have checked the extruder for skipping stepper and jamming filament all with no change. It's not simply the height triggering a dodgy connection because the 50mm cube prints perfectly.

I have printed many tens of Kg of filament over the years but never seen this, neither can I see it in any of the many troubleshooting guides online.

Any suggestions very welcome indeed!

Now, if I can only share this image right... Image


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Re: Strange lumpiness after print is about 1cm high

Post by iDig3Dprinting »

A picture would be handy, lumpiness could cover all many of surface anomalies.

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