Update image for the Heart Box project.

3D Printing
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Update image for the Heart Box project. The red stand is coming out great even at .2mm 50mm/s rushed print settings. IN-PLA Red, freaking love this stuff hope Taulman continues to make it. Second to last image shows a weird overhang error I am getting on only one side of this mirrored form that is supposed to be symmetrical :stuck_out_tongue:

I think it might be the movement of the effector/bowden but I am not sure, it doesn’t happen except extreme 58 degree or more overhangs and only in one quadrant of the delta print area, and then not on all prints. It may be the infill under extruding on the start or end side slightly, the overlap connection to the perimeters interacting with the hard to print overhang.

It looked like the infill path is symmetrical but as it starts on one side and finishes on the other it can make things unsymmetric internally as far as extrusion amounts. The extrusion amount might need a positive or negative on restart adjustment.

In the last pic you can see I got rid of all but one or two slight bumps with a 90 turn of the print in S3D, as a quick test fix I am very glad worked. Might drop to 45mm/s to smooth it out but I think I might live with it as it’s not very bad. Not going to try and fix restart fine extrusion with like 24 hours to get 17 hours of printing done. I have to get prints off the bed and restart as soon as possible to get the entire order done on time. Just irks me that the other side comes out perfect, I have zero time to do any more fixing. At least they take 1 hour 30 minutes so I can get some OK sleep in between removing prints and restarting. Wanted to print sets but it’s not really faster just less tedious. Whatever, this needs to be done and done right so I will just catch up on sleep on wednesday when I get word it has been delivered.

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Looks like improper cooling. I’m assuming your fan is on the opposite side?

3

Typically for a one-sided overhang issue like that, I would look at asymmetrical airflow around the nozzle. Putting blower fans on both sides or rotating the model so the overhang faces a fan should help.

4

actually no fans except indirect from the hotend fan, it’s not directed down so very little of that. going with fine PID control thanks to the Duet 32 bit magic. Doesn’t get more than .8 degrees off ±. I found the fan made multiple parts impossible blowing strings from travels onto other parts when printing PETG, haven’t repositioned them for this PLA it prints well enough without. Possibly the ambient airflow is enough on one side and not on the other, but it’s pretty subtle error. I am not sure its an airflow issue, just doesn’t seem like it watching it print through the area. Not lifting just sort of printing slightly weird there, might be mechanical as it’s like a tiny area of a truncated radius, just .05 or something in or out, and it allows the next layer to fall off the form or it falls off on its own loop (the error layer being ‘it’). However, other models print perfectly at that height so its not a rail surface issue for the bushings, it stays with the model section as its rotated in slicing so it really can’t be all mechanical… but it happens on different models, so it must be? Or maybe I am just waking up having missed the alarm for print 4 and now I am 2 prints and 3 hours behind… and can’t think right without coffee asap!!!

5

It really does look like the finish I get on the leeward side of round prints like the Marvin model or a Benchy. Adding airflow fixes it for me.

6

That’s really cool. Turn out nice.