What's the difference in the two parts below and what caused it? They were printed with the same .gcode on different printers (both Gigabots).
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8 comments
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Kevin Harada Assuming they used Simply3D to generate their GCODE I'd assume that extrusion coefficient or multiplier is being set in the GCODE. This would also mean that each printer really needs different extrusion coefficients, maybe they have slightly off nozzles due to wear?
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Tj Nguyen It looks like over-extrusion. If they're different printers, my first guess would be wrong e-steps for the extruder for the one on the left. You didn't say anything about the filament either so they could be different quality.
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Samantha Reeve You both are hitting the root of the problem, but not the reason for the problem in this case. Any other guesses?
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Tj Nguyen two different diameter nozzles?
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John Colborn The part on the left looks slightly over-extruded.
With two different machines, there would be two different extruder nozzles and two different spools of raw material. Both of these typically need dialing-in on a per-machine and/or a per-spool basis e.g. with 'calibration prints'. If these trimmed values occur within the slicer, and the gcode is the output of the slicer, then both machines got the exact same instructions without benefit of individually 'trimming' for each, separate machine.
Is that what caused the difference in the two parts?
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Samantha Reeve Our raw material is almost always consistent enough to to not give us different print qualities for the same material and color. The nozzles were physically different, but the same size from the same manufacturer. We keep 8-15 Gigabots in house and use the same settings for each printer configuration. Keep guessing!
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John Colborn Was there an issue or difference with the filament drive mechanism or drive nut (the toothed-wheel which is meant to grip the filament as it is pushed in)? Different clamping force on the toothed-nut causes the nut to have an effectively different 'diameter' due to the depth of 'bite' into the filament, for example. In another example, I have had drive nuts get filled with foreign material which causes the nut to have an effectively larger-diameter, or slip against the filament at times.
Was there an issue or difference with the filament drive mechanism?
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Samantha Reeve Yes, it was printed on different generation Gigabots with different extruders. The one on the left was printed with GB2 and and the one on the right was printed on GB3+ and the file was sliced for GB3+. This caused the extruders to need different steps per millimeters and under extruder the part on the left.
We will reach out to you for another free 5lb spool of PLA.
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