Dr. Lawlor's Code, Robots, & Things

July 17, 2015

Flailing squid: 3D printer adhesion failure

Filed under: Random Thoughts — Dr. Lawlor @ 12:21 am

After starting an all-night print, I checked on my printer this morning to discover this many-tentacled glob of plastic, which apparently ate my print:

3D printer with orange plastic squirting in all directions from extruder.

3D printer with orange plastic squirting in all directions from extruder.

The problem here is the print head grabbed one corner of the print, and peeled it up.  With that corner sticking up as leverage, it incrementally peeled up the rest of the print, which stuck to the hot nozzle.  Since I’d left the printer running unattended (bad idea!), it KEPT PRINTING, with plastic squirting in all directions, resulting in an annoying-to-remove glob instead of a clean print.

The fix was to heat the hotend back up, and carefully clip away the gobs of excess plastic.  I had to be fairly careful, because the hotend’s heater and thermistor wires were buried in the goo.  I’ve wrapped them more securely in kapton tape for when this happens again.

This was with rubbery NinjaFlex, but I’ve had the same thing happen with ordinary ABS.  The trick is keeping an eye on the printer while it prints!

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