Diagonal lines in prints
-
See what difference not interpolating the extruder steps makes:
M350 E16 I0
Thanks for the idea - I tried it but surprisingly it still looks the same.
I also tried moving the extruder stepper wires, hot end power and thermistor wires over to the second set of plugs - didn't help : /
-
Ran some more tests where I changed the steps per mm to see if the diagonal lines changed angle and turns out they dont - it's just hard to tell sometimes but the angle of the lines is different on some sides of every cube.
Now I'm much more suspect of the pulleys as MiR suggested - will check that next.
I took apart the titan extruder and noticed the idler that rides against the hobb gear has a bit of wobble to it - and I think it's from the gear?
https://goo.gl/photos/hzUhnTGuvzgFeM6t9
Flipped the gear and still see it
https://goo.gl/photos/oziQfsHv4FPEwABk6Tried with just a piece of plastic to remove the idler as the problem and moved the gear up to try to eliminate any affect from the shaft.
https://goo.gl/photos/hkQEasigaQgCNcNu7Also tried tightening the grub on the round part of the shaft instead of the flat in case it would take up the play better but didn't notice a difference.
It needs a full rotation to achieve the wobble, and with the lines as tight as they are I suspect that's not the problem.
To summarize - factor's that don't seem to affect it
-Print speed
-Hotend Temp
-Heated bed on or off
-Fan speed from 50% - 100%
-Part position on bed
-Part rotation
-Extruder stepper current changes
-Lowering extrusion factor in web interface to 85%
-Increasing stepper wire gauge
-Twisting stepper wires / thermistor wires
-Extruder stepper interpolation turned off
-Extruder tension
-Filament slack
-Swapping extruder stepper for a different type (started with .9* and then tried a 1.8*)
-Two different e3d hotends / extruder configurations (Titan and D300vs stock)
-Layer height (tried .15, .2, .268 - all look the same)
-Changing the extruder steps per mm -
@MiR:
Are your pulleys running smoothly? I bought one pulley that had a non-centric bore, as the pattern on the parts is regular that's perhaps worth checking.
Aaaaaahhhhhhhhh I THINK YOU WERE RIGHT. One of my pulley's isn't concentric. Gotta order a replacement. Wow thank you so much for suggesting that - I never would have found it. I'll mark this answered if it proves to be the problem.
-
I suspect a problem with your extruder. That's why the angle of the lines changed when you changed the E steps/mm. If I am right, it will also change if you alter the extrusion width in your slicer.
The actual problem is likely to be the hobbed insert not being uniformly round, and so not driving the filament evenly as it rotates. This could be caused either by a manufacturing defect or by the splines on one side of the insert being blocked with filament or other debris.
The pulley needs to be fixed too.
-
I think you're right about the extruder - here's a clip of the titan idler that rides tightly against the stepper gear.
https://goo.gl/photos/Yc6R1PegXFZpS4Nb7
I suspect this wobble shouldn't be here, though it takes a full rotation which is much longer than the space between the diagonal line steps..so I'm not sure. I think tightening the idler impacts the lines a little bit so that's more evidence.
-
E3D is sending me a new pinion gear, but some more interesting developments..
Someone with a well tuned D300VS printed the same objects I'm having this effect on (single perimeter, PLA) and they're also seeing the patterns, but observed it doesn't seem to impact the actual surface, just the way light is interacting with the print. They were using the stock extruder.
I also observed when printing a hexagon shape, the sides closest to the towers had the lines more prominent, and the sides on the opposite were hardly visible. Seen here https://goo.gl/photos/hnc4CBySY3rispkYA If I print next to a tower I can see it on all sides.
I'm not sure what carriages they were using but I know the stock ones use a screw to tighten the carriages to the rails, and doing so creates a .5mm to 1mm difference in magball spacing between the carriage balls and effector's. I have some eccentric spacers I may reprint carriages for…or I might just let it go at this point : )
-
I printed a 40x40x40 single walled object in vase mode. If I look hard enough, I can see the lines you are talking about. But, dang, I do have to look to see them.
-
I printed a 40x40x40 single walled object in vase mode. If I look hard enough, I can see the lines you are talking about. But, dang, I do have to look to see them.
Thanks for giving it a try
Perhaps I've hit a limit of some kind. I wonder if it's delta specific -
Woooo I fixed it!
Well 95%I guess the difference the carriage warp was making on the mag ball positions was enough to cause the effect. Switching over to eccentric spacers significantly improved it!
-
That does look better. Good to see results.
