Riddle me this.
Posted by elwood127
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Riddle me this. June 08, 2015 06:20PM |
Noticed some shifting going on lately so I made sure glass wasn't moving and marked my Y pulley and belt with a felt tip to check for belt slippage after installing a new y tensioner. Ran this last night. Belt and pulley marks are exactly where they were before printing. Not quite a pyramid. Can software be slicing weird. Using Cura and Repetier.
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Re: Riddle me this. June 08, 2015 11:21PM |
For what it's worth, I'm reprinting it using Slic3r right now and it's perfect so far. What up with that?
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Re: Riddle me this. June 10, 2015 03:31AM |
You have to tell Cura what machine you are using and the size of the bed/ nozzle etc.
A computer program is not smarter than the user
-Olaf
A computer program is not smarter than the user
-Olaf
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Re: Riddle me this. June 11, 2015 11:04PM |
Well. after getting a nice print of the pyramid with Cura I decided to use it to create the Terminator skull to compare with the one I had done using Slic3r. Red is the Slic3r print. I'm totally confused now. Granted the settings are faster in Cura so I'll try it again matching my Slic3r settings and report back.
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Re: Riddle me this. June 12, 2015 12:44AM |
.24 layer height. .4 nozzle. Here is the resliced and printed Cura next to the Slic3r print. I killed it because it had shifted an inch already. What the hell?
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Re: Riddle me this. June 12, 2015 01:45AM |
The black skull sure got chopped from a nozzle driving into the previous layers. Try reducing the fill-rate or e-steps. It´s soo frustating to have a 99% finished print going wrong. 
Looks like you have a binding axis.
Still too much tension on the belts or not enough current to the steppers? Or a bad linear bearing grinding into the smooth rod?
What´s the temp of the steppers? Can you still touch them after a longer print? Then they are ready to take more current.
It is not only the speed, that is important but also acceleration causes skipped steps.
For x&y, I reduced the acceleration from 9000 to 6000.
In your case ( with the lead screws ), it would be good to lower z-speed and z-acceleration as well.
-Olaf
Edited 1 time(s). Last edit at 06/12/2015 01:53AM by o_lampe.
Looks like you have a binding axis.
Still too much tension on the belts or not enough current to the steppers? Or a bad linear bearing grinding into the smooth rod?
What´s the temp of the steppers? Can you still touch them after a longer print? Then they are ready to take more current.
It is not only the speed, that is important but also acceleration causes skipped steps.
For x&y, I reduced the acceleration from 9000 to 6000.
In your case ( with the lead screws ), it would be good to lower z-speed and z-acceleration as well.
-Olaf
Edited 1 time(s). Last edit at 06/12/2015 01:53AM by o_lampe.
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Re: Riddle me this. June 12, 2015 08:25AM |
I just had a similar failure like your black skull accident.
The z-axis stopped moving, although everything was cold ( steppers and driver )
The printer moved on printing, but started rubbing against the layers, so I got alarmed and stopped the print.
Reason:
I have set the max height of my printarea to 150mm in Marlin, but 200mm ( Default ) in Cura.
So the slicer wasn´t aware of the limited z-height and Marlin refused to raise z higher than 150mm
Lucky it was just a testprint. The real print with 0.2 nozzle and 0.1 layer would´t have taken 34h....
-Olaf
Edited 1 time(s). Last edit at 06/12/2015 08:27AM by o_lampe.
The z-axis stopped moving, although everything was cold ( steppers and driver )
The printer moved on printing, but started rubbing against the layers, so I got alarmed and stopped the print.
Reason:
I have set the max height of my printarea to 150mm in Marlin, but 200mm ( Default ) in Cura.
So the slicer wasn´t aware of the limited z-height and Marlin refused to raise z higher than 150mm
Lucky it was just a testprint. The real print with 0.2 nozzle and 0.1 layer would´t have taken 34h....
-Olaf
Edited 1 time(s). Last edit at 06/12/2015 08:27AM by o_lampe.
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Re: Riddle me this. June 12, 2015 10:46PM |
I ran a test cube and cylinder each using Slic3r and Cura. Settings as close as posible given their differences. The left cylinder is Slic3r @ 21 minutes, the right is Cura @ 10 minutes. As you can see the left is smoother, the right misaligned on the last layer in the Y axis and is much rougher.
The left cube is Slic3r @60 minutes, the right is Cura @ 13 minutes. The left is smoother with soft corners, the right is rougher but has crisp corners.
One interesting note, the terminators first misalignment ( using Cura) is at 1 inch up, exactly where the cylinders misalignment took place yet nothing on the cube.
I'm not sure what to make of all this data. Atleast it's confimed that slower printing yields better finishes. As far as the time differences using similar settings, I'm not sure.
You all may want to do some tests and see what you get.
The left cube is Slic3r @60 minutes, the right is Cura @ 13 minutes. The left is smoother with soft corners, the right is rougher but has crisp corners.
One interesting note, the terminators first misalignment ( using Cura) is at 1 inch up, exactly where the cylinders misalignment took place yet nothing on the cube.
I'm not sure what to make of all this data. Atleast it's confimed that slower printing yields better finishes. As far as the time differences using similar settings, I'm not sure.
You all may want to do some tests and see what you get.
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Re: Riddle me this. June 13, 2015 12:46AM |
I went back into Cura and drop to 60mm/sec from 80mm speed with no noticable change. Finally got down to 30mm/sec to mimmick Slic3r movements. (Left) is the Slic3r cube @ 80mm/sec (Center) is Cura @ 30mm/sec and (Right) is Cura @ 80mm/sec.
At 30 Cura is almost as smooth as Slic3r. How can these 2 programs be so different regarding speed settings? Last time I checked 30 is not 80. Maybe one of you brainiacs can ask whoever knows these things. Am reprinting Arnold at slower settings to see what happens.
Edited 1 time(s). Last edit at 06/13/2015 06:16PM by elwood127.
Edited 1 time(s). Last edit at 06/13/2015 06:16PM by elwood127.
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Re: Riddle me this. June 13, 2015 06:22PM |
The problem is that there is a 50mm/sec difference to get the two programs to run at the same speed. I wonder if there is a way to measure actual speed. A lot of people are trying Cura and getting crappy results thinking they are using the same settings as Slic3r. Thanks to everyone for your input. Here is the T-800 ran on Cura @ 30mm/sec.
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