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SoliForum - 3D Printing Community → Hacks & Mods → Odd problem following carriage and e3d hotend install
So I spent some time this weekend and installed both the better carriage with linear bearings, and my e3d hotend. What I found was that as the print runs, it extrudes more filament than normal towards the back of the printer (ABS oozes up), and less towards the front (leaving gaps in what should be solid infill). Its not the bed being un level, since the problem continues as the print progresses.
Any thoughts?
Is your filament feeding in well? If it's snagging as it goes forward maybe it's skipping sometimes while printing in the front (greater resistance on extruder.) That would go in line with the idea that the e3d has a bit more resistance feeding in.
That's my best guess....
If you can, sketch up some test that might exasperate the problem so you more info. I can't think of what that would be. heading to bed now - brain is half off.
P.S, may I ask: Did you use those replacement carriage files found on the forums? And was that printed in ABS or PLA? I was tempted to upgrade to one of the bearing carriages, though I will try to print nylon bearings to reduce the noise of the printer.
Sounds like your extruder is tilted along the Z axis with respect to the Y axis, you can either shim the extruder or adjust it via the back X rod is oriented in the printhead.
Sounds like your extruder is tilted along the Z axis with respect to the Y axis, you can either shim the extruder or adjust it via the back X rod is oriented in the printhead.
better call
Sounds like your extruder is tilted along the Z axis with respect to the Y axis, you can either shim the extruder or adjust it via the back X rod is oriented in the printhead.
That was the problem. Why I'm not quite sure since if the hot end is tilted away from Z, it should be tilted the same amount across the whole print bed. Either way, the flat portion of the carriage was printed fine, but the residual amount of 'brim' on the part when printed wasn't trimmed entirely, so the jigsaw mounted at an angle. I filed it down and remounted it just fine.
Just as a matter of precaution I got the last tiny bit of backlash due to loose linear bearings out by using hot glue to fill in the gaps, so now there is no slop in the carriages at all. Did some full print bed sized prints last night and they worked great. I still have to do some calibration to fix the moire problem but that can be done soon enough.
As a final calibration, you could place some 320 grit sand paper on the (recently leveled) bed. Turn the z axis screw by hand until the nozzle just contacts the sand paper and run the extruder back and forth a few times in both axes until the scratch mark is smooth and symmetric. Less is more here. This makes the nozzle surface perfectly parallel with the bed surface which has obvious benefits. And no, this did not clog our extruder nozzle.
Our SD3 was shipped pretty wonky. The extruder body (bolt) actually looks to be slightly bent (even after extruder disassembly), and the X & Y axis belts needed aligning. We experienced exactly the same phenomenon you described.
But at $800, I expected a work in progress. It has paid for itself a few times already since May.
SoliForum - 3D Printing Community → Hacks & Mods → Odd problem following carriage and e3d hotend install
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