No more than 24 file listed from SD with M20 command January 25, 2014 04:54PM |
Registered: 10 years ago Posts: 19 |
Re: No more than 24 file listed from SD with M20 command January 25, 2014 05:10PM |
Registered: 10 years ago Posts: 191 |
Re: No more than 24 file listed from SD with M20 command January 25, 2014 05:11PM |
Registered: 13 years ago Posts: 1,611 |
Re: No more than 24 file listed from SD with M20 command January 25, 2014 05:32PM |
Registered: 10 years ago Posts: 19 |
Re: No more than 24 file listed from SD with M20 command January 25, 2014 05:51PM |
Registered: 10 years ago Posts: 14,672 |
Re: No more than 24 file listed from SD with M20 command January 25, 2014 05:53PM |
Registered: 13 years ago Posts: 1,611 |
Re: No more than 24 file listed from SD with M20 command January 25, 2014 05:55PM |
Registered: 10 years ago Posts: 14,672 |
Re: No more than 24 file listed from SD with M20 command January 25, 2014 11:03PM |
Registered: 10 years ago Posts: 147 |
Re: No more than 24 file listed from SD with M20 command January 26, 2014 03:00AM |
Registered: 10 years ago Posts: 14,672 |
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PaulHam
Does the paper/tape need to be underneath the kapton tape?
Re: No more than 24 file listed from SD with M20 command January 26, 2014 07:29AM |
Registered: 10 years ago Posts: 2,472 |
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dc42
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PaulHam
Does the paper/tape need to be underneath the kapton tape?
Only if you want to print right up to the corners where the tape/paper is.
Re: No more than 24 file listed from SD with M20 command January 26, 2014 08:33AM |
Registered: 10 years ago Posts: 14,672 |
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dmould
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dc42
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PaulHam
Does the paper/tape need to be underneath the kapton tape?
Only if you want to print right up to the corners where the tape/paper is.
Except that you cannot put the tape on the corners of the glass. The tape must be offset in the -ve X direction due to the displacement of the sensor from the nozzle and cannot be at the Y edges because the head fouls the clips. So the tape/paper must be at 60mm from the edges in the Y direction and 20mm or so off the edge in the +X direction, which pretty much halves the print area if you cannot print over the tape.
Dave
(#106)
Re: No more than 24 file listed from SD with M20 command January 27, 2014 03:26PM |
Registered: 10 years ago Posts: 2,472 |
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dc42
Of course you can put tape on the corners of the glass. If you are still using foldback clips then I suggest you look at the photo frame clips that many of us are using instead. They only encroach the Y axis by 3mm at each end. I don't understand your point about offsetting the tape in the X direction. Sure, the sensor is offset from the nozzle, but sensor will still be able to determine the angle at which the bed tilts, which is what matters.
Re: No more than 24 file listed from SD with M20 command January 27, 2014 07:01PM |
Registered: 10 years ago Posts: 14,672 |
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dmould
With X axis at the physical end of its travel (end of the arm), my IR sensor is still 12 mm in from the edge of the glass - it cannot physically move any closer to the edge because the LU bearing is hitting the plastic part that holds the runner.
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dmould
It's not IMO a good idea to make your X set point closer than 3mm from the end-stop to prevent a collision in case the home position changes a bit (which it always seems to do after a G30 command, and it probably also changes a bit with different illumination levels around the X stop tab as well). To give a 10mm diameter target size and an end-stop margin of error the tape has to extend in by 12+3+5 = 20mm from the edge of the glass.
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dmould
No, I haven't changed my clips yet, but then I am not using the automatic Z-homing or bed levelling because I am not finding it to be consistent enough.
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dmould
Incidentally, when I tried out the automatic bed levelling command, while the head travelled to each of the 4 set points in turn, it only seemed to take measurements from the first two and the last point - although of course only 3 points are necessary, so I don't know why 4 are used in any case.
Re: No more than 24 file listed from SD with M20 command January 28, 2014 08:23AM |
Registered: 10 years ago Posts: 2,472 |
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dc42
If you are printing on Kapton, you put the white tape or paper under the Kapton, then you can still print on that area. One concern is that the thickness of the tape or white paper affects the bed height at that point. So you need to use thin tape or thin paper. Even if you want to avoid printing over the tapes, you can still print e.g. a circular object almost 200mm in diameter.
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dc42It's much more consistent with a modulated IR sensor.Quote
dmould
No, I haven't changed my clips yet, but then I am not using the automatic Z-homing or bed levelling because I am not finding it to be consistent enough.
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dc42I used to use 4-point levelling, and the head did take a measurement at all 4 points. Currently I use 3-point levelling. But even if the glass bed is perfectly flat, 4-point levelling is useful unless you can guarantee that the two y-axis rods are exactly parallel. If there is a twist between them, then the amount of bed tilt in the x-direction will depend on the y-position.Quote
dmould
Incidentally, when I tried out the automatic bed levelling command, while the head travelled to each of the 4 set points in turn, it only seemed to take measurements from the first two and the last point - although of course only 3 points are necessary, so I don't know why 4 are used in any case.