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So yep, another article. This time I write about designing your rods size and delta radius taking care about the accuracy distribution at the printing área, providing math tools to make your own calculations for your own requirements. The article needs some more developement, but I'm a little busy.
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PurpleSensation
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Delta Machines
QuoteMKSA
I made my own system that requires a minute head movement. I looked at how Renishaw probes work
Interesting, video of your printer? I have seen some Renishaw videos and It would be very very ok to have some kind of soft contact detector by vibrations or whatever.
Maybe u should write the next paper!
by
PurpleSensation
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Delta Machines
I think that's the clearest image I actually have, I haven't printed anything for several months and everything I print are mechanical pieces currently in use so is not easy to take a photo from them. That's a 0.25 layer width and It represent pretty well well the overall quality. I can't take images closer without a good camera. I know is subjective, but I can say it tastes really soft when touc
by
PurpleSensation
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Delta Machines
It's a nice idea. But I'm pretty sure that I have already reached the max quality allowed by my nozzle width, nema motors and delta geometry. The theoretical accuracy I reach is the one provided by those parameters. And the surface quality is probably the best that a PLA printer of 0.4 nozzle can reach, all those pieces showed in the paper were printed by this printed itself (with the previous ve
by
PurpleSensation
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Delta Machines
I am pretty sure I answered all those issues you talk about on the text. I have no problem with the axis because I designed an "elastic" hole so there's no space between the rod and the rocker, the union is perfectly perpendicular with no vibrations. The rocker itself is rigid. I don't use a spring to fix the rocker because, as you say, it is a bad option, I use a screw easy to turn by hand. If y
by
PurpleSensation
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Delta Machines
So I decided to develop some articles about things I designed for my own 3d Printer while I was building it. I think this analysis is useful for both the content itself and to show a cool way for exposing knowledge of something even in the internet community.
Enjoy, comment and add ideas. I have been using this mechanism for 3 years now and it has huge success on my printer. It is robust, accura
by
PurpleSensation
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Delta Machines
All of this has nothing to do with the main topic and also the video has nothing to do with calibration mathematical models. It is just another technical way of detecting proximity.
by
PurpleSensation
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Delta Machines
You may have dimensional error on the pieces, and the print head may be oscillating, so if the probe z-height is oscillating also. It happened to me, I solved it with a self made design off head which use the nozzle as probe.
by
PurpleSensation
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Delta Machines
If you explain to me I can add it to the text.
A friend and me have used this method and both got great results. I used it working with 1.2% of dimensional error and in one calibration I got 0.13% dimensional error (without dilation), with not collateral effects.
by
PurpleSensation
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Delta Machines
You are right in the theory, however there are some points that make that effect not to affect to the domestic user using this method:
-Shape inaccuracy after/before calibrating is on the order/under the order of the usual printer resolution for a Nema17 motor supposing we are correcting around 2% dimensional error max.
-You might want to use a method like least squares (for example) to calibrat
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PurpleSensation
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Delta Machines
Thanks Khalid for your commentary. It's a very good idea to output the particular parameters for Marlin and Repetier Firmware in the Excel file, I'll work on it.
The Hexagon can be printed with all your particular parameters but the diagonal rod ones. I', not sure if Marlin let you modify particularly the x,y and z diagonal rod length without modifying the source code, but for printing the Hexag
by
PurpleSensation
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Delta Machines
Hello everybody, after too much time calibrating manually the "diagonal rod" value which gives me optimal dimensional accuracy, I've decided to calculate the exact value for a given geometry and a measured dimensional error:
I have written all the process in a little text to share with all of you:
And I have implemented the method in a Thingiverse publication:
This method worked wonderful
by
PurpleSensation
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Delta Machines
I thing this is a very neccesary option, because sometimes very short segments introduce vibrations on the print and overheat unnecesarily that part.
A good example is the printing off gears theeths , where slic3r use to infill with little perimeters on each teeth, travelling teeth by teeth, and sometimes ozzing
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PurpleSensation
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Slic3r
My problem is that slicer treats EVERY solid layer as a bridge, it overlays the infill parameters and prints it with the brigding configurations, what ussually is a dissaster, because pieces are so light and weak
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PurpleSensation
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Slic3r
I have a problem, every solid infill that slic3r produces, produces it as bridging, with its options. I dont know why. Please help.
The profile used on the config.ini is "cosas detalladas"
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PurpleSensation
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Slic3r
Wheels has much less torsional resistance, i recomend linear rods, i use wheels and they use to be much more expensive if you dont have a lead
by
PurpleSensation
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Delta Machines
Using brim absolutely helps with this problem, i recomend this process when someone have to print a large piece, and much more important if this piece has spikey corners:
-Clean very well the base
-Spray it (a lot) before placing it on the printer
-Place it
-Calibrate z-height with a tipical 3 point method
-Print it with 2mm brim
First layer must be opaque! Not translucid and not too thick, yo
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PurpleSensation
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Delta Machines
I solve it with tons of hair spray, because large pieces with spikes, it doesnt matter how well your z heigh is calibrated, it can warp and unstick.
And use 2mm brim
by
PurpleSensation
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Delta Machines
On a delta printer, the XY scaling doesnt really work because the dimensional errors are on the oposite direction of each tower, so XY scaling just repair a little bit of the problem.
You must calibrate the Diagonal rod lenght correction, there is some ways to do it:
First, calibrate your horizontal radious to have z height well calibrated, then you can calibrate correction manually (+Diagonal
by
PurpleSensation
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Delta Machines
40 jerk may be little high, I print wonderfully with 20 XY jerk.
What kind of linear guide are you using? If you use bad wheels it can be a trouble.
Also check if the belt is well tensioned or the motor are a little under/over powered, I adjust them lowering down the power until the motor barely can move the carriage and the increasing it a ~15%.
The dimensions clearly are a problem of dimensiona
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PurpleSensation
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Delta Machines
You can try the new method that I have been developing for dimensional calibration, its easy fast to implement and it worked wonderfully for me.
And I need some feedback!
by
PurpleSensation
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Delta Machines