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{{EggBotDocs}}
 
 
 
If you are having quality issues with your prints that might be due to a misalignment of some sort, we hope that this guide will help you to find the source of the problem. This guide contains some helpful pictures that show how configuring the EggBot in different ways can produce different outcomes.   
 
If you are having quality issues with your prints that might be due to a misalignment of some sort, we hope that this guide will help you to find the source of the problem. This guide contains some helpful pictures that show how configuring the EggBot in different ways can produce different outcomes.   
  
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=== Our test file ===
 
=== Our test file ===
https://cdn.evilmadscientist.com/wiki/eggbot/quality/1A.jpg
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This is the test file that we'll be using for most of the examples. Note that the print quality is fine and consistent.  The "O's" have closed shapes, the vertical parts are vertical, the horizontal parts are horizontal, the slants of the "W's" have consistent width, and so forth.  (Some of the examples that we'll show later ''do not'' have these properties!) Additionally, one should be able to print an example like this ''several times over itself'' without seeing any variation except that the lines appear darker after each successive pass.
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This is the test file that we'll be using for our examples. Note that the print quality is fine and consistent.  The "O's" have closed shapes, the vertical parts are vertical, the horizontal parts are horizontal, the slants of the "W's" have consistent width, and so forth.  (Some of the examples that we'll show later ''do not'' have these properties!)
  
You can download the example file [https://cdn.evilmadscientist.com/wiki/eggbot/quality/calexamples/demo2.zip here].  
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You can download the example file here. (TODO: ADD LINK)
  
This was printed with the [http://shop.evilmadscientist.com/productsmenu/tinykitlist/171-egg-bot Deluxe EggBot] on a chicken egg with an Ultra Fine Point Sharpie.   
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This was printed with the Deluxe EggBot on a chicken egg with an Ultra Fine Point Sharpie.   
The egg was oriented with its "fat" side (the side pointing down in the photo above) pointing towards the egg motor (headstock).   
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The egg was oriented with its "fat" side pointing towards the egg motor (headstock).   
  
 
The print settings were as follows:
 
The print settings were as follows:
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** Reverse motion of Motor 2 (egg): checked
 
** Reverse motion of Motor 2 (egg): checked
 
** Egg (x) axis wraps around: checked
 
** Egg (x) axis wraps around: checked
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** Start with pen centered: checked
 
** Return home when done: checked
 
** Return home when done: checked
 
** Enable engraver, if attached: unchecked
 
** Enable engraver, if attached: unchecked
 
** Curve smoothing (lower for more): 0.2
 
** Curve smoothing (lower for more): 0.2
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=== Dry pen ===
 
=== Dry pen ===
https://cdn.evilmadscientist.com/wiki/eggbot/quality/3A.jpg
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A common problem that can happen when using old pens, or pens that have been left uncapped is that the pen does not start drawing immediately when you expect it to. It is ''usually'' easy to fix this problem by taking a scratch piece of paper and, right before you start your EggBot, "bleeding" your pen a little on the paper to get the ink flowing again, as shown below. Sharpie pens last approximately forever if treated well; if it doesn't start drawing immediately, you might consider leaving it capped for a few days and trying again, rather than throwing it out. You might also consider wetting the tip with solvent to reconnect the tip to the ink reservoir in the pen. For example, with a Sharpie you would make a small puddle of Isopropyl (rubbing) alcohol on a piece of paper.  Then you would dip the dried-out tip in the puddle, and then try scribbling on the paper to see if ink flow begins.
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A common problem that can happen when using old pens, or pens that have been left uncapped is that the pen does not start drawing immediately when you expect it to. It is ''usually'' easy to fix this problem by taking a scratch piece of paper and, right before you start your EggBot, "bleeding" your pen a little on the paper to get the ink flowing again, as shown below. Sharpie pens last approximately forever if treated well; if it doesn't start drawing immediately, you might consider leaving it capped for a few days and trying again, rather than throwing it out.
  
  
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=== Alignment of the egg in the egg cups ===
 
=== Alignment of the egg in the egg cups ===
https://cdn.evilmadscientist.com/wiki/eggbot/quality/15A.jpg
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This skewed image is the result of misaligning the egg within the couplers, like so (exaggerated for clarity):
 
This skewed image is the result of misaligning the egg within the couplers, like so (exaggerated for clarity):
  
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This egg is properly aligned.
 
This egg is properly aligned.
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=== Loose Eggs & Screws  ===
 
=== Loose Eggs & Screws  ===
https://cdn.evilmadscientist.com/wiki/eggbot/quality/17A.jpg
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If your plots look like this, with circles that don't close and differing widths of your letter parts, it likely means that something is loose.  It can be either the egg itself-- slipping in the coupler -- or a loose screw somewhere on the EggBot.  Make sure that the egg has a secure connection to the motor through its coupler, and can't wiggle independently of the motor.  And, make sure that the screws on the EggBot are tight and secure (you can also check our troubleshooting guide [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#precision here]).  
 
If your plots look like this, with circles that don't close and differing widths of your letter parts, it likely means that something is loose.  It can be either the egg itself-- slipping in the coupler -- or a loose screw somewhere on the EggBot.  Make sure that the egg has a secure connection to the motor through its coupler, and can't wiggle independently of the motor.  And, make sure that the screws on the EggBot are tight and secure (you can also check our troubleshooting guide [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#precision here]).  
  
  
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If the hex screw below the pen arm's hinge is loose, the pen arm will move left and right as the pen is dragged across the egg. Try to gently wiggle the pen arm left to right. With the exception of the normal flexing of the hinge, it should not move at all.
 
If the hex screw below the pen arm's hinge is loose, the pen arm will move left and right as the pen is dragged across the egg. Try to gently wiggle the pen arm left to right. With the exception of the normal flexing of the hinge, it should not move at all.
  
  
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In this case, the screw  that mounts the distal pen arm assembly to the proximal pen arm (shown below) was loose, with the kind of poor results that you might expect.
 
In this case, the screw  that mounts the distal pen arm assembly to the proximal pen arm (shown below) was loose, with the kind of poor results that you might expect.
  
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https://cdn.evilmadscientist.com/wiki/eggbot/quality/19A.jpg
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The plot above-- where the pen is wandering "all over the place" was caused by trying to draw when the screw that holds the pen was loose (about to drop the pen).
 
The plot above-- where the pen is wandering "all over the place" was caused by trying to draw when the screw that holds the pen was loose (about to drop the pen).
  
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To check if the pen is securely fastened, gently try to pull it out.  
 
To check if the pen is securely fastened, gently try to pull it out.  
 
 
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===Pen arm bumps against frame===
 
https://cdn.evilmadscientist.com/wiki/eggbot/quality/20A.jpg
 
 
Here is the "diamond" test pattern, shown without any major quality issues (for reference). (You can download the example file [https://cdn.evilmadscientist.com/wiki/eggbot/quality/calexamples/SimpleDiamonds.svg here].)
 
 
 
 
https://cdn.evilmadscientist.com/wiki/eggbot/quality/21B.jpg
 
 
https://cdn.evilmadscientist.com/wiki/eggbot/quality/21A.jpg
 
 
Here is the same pattern, but drawn with the EggBot misaligned such that the starting position of the pen arm was poor and the pen arm bumped into the tailstock of the EggBot while drawing. When the pen arm reaches the end of its range, it may bend and try to continue plotting there, or the motor may skip a step ("cog") and lose alignment.
 
 
If you are having trouble with hitting the sides, check before plotting -- using the manual ("walk motor") commands if necessary -- to make sure that the pen arm has free travel over the entire range that you intend to use. For more information about positioning the pen arm, see [http://wiki.evilmadscientist.com/Framing_and_Pen_Centering here].
 
 
If the pen moves but seems to just "fall over" without any resistance, you may still need to [[Making_your_first_plot#Drawing_on_your_Egg|adjust your motor current]].
 
  
  
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=== Vertical position of the pen motor ===
 
=== Vertical position of the pen motor ===
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The pen motor can be moved vertically to adjust the pen arm for drawing on spherical or ellipsoidal surfaces. For drawing on chicken eggs, we normally position the pen motor about in the middle of the slots as shown here. For a sphere, position the motor at the very top of its slots.  For a more elongated egg (maybe a turkey egg?) you may need to go lower yet in the slots.
 
The pen motor can be moved vertically to adjust the pen arm for drawing on spherical or ellipsoidal surfaces. For drawing on chicken eggs, we normally position the pen motor about in the middle of the slots as shown here. For a sphere, position the motor at the very top of its slots.  For a more elongated egg (maybe a turkey egg?) you may need to go lower yet in the slots.
  
  
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If the pen motor is positioned too high in the vertical slots (here, at the top of its slots while printing on a chicken egg), the pen will not make contact over the full surface.  To correct this, lower the motor in the slots.
 
If the pen motor is positioned too high in the vertical slots (here, at the top of its slots while printing on a chicken egg), the pen will not make contact over the full surface.  To correct this, lower the motor in the slots.
  
  
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https://cdn.evilmadscientist.com/wiki/eggbot/quality/12A.1.jpg
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Conversely, if the pen motor is too low in its slots, the pen may not make contact at the edges of the plot region.
 
Conversely, if the pen motor is too low in its slots, the pen may not make contact at the edges of the plot region.
  
https://cdn.evilmadscientist.com/wiki/eggbot/quality/11B.jpg
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=== Headstock / Tailstock position ===
 
=== Headstock / Tailstock position ===
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When the headstock is correctly positioned, the shaft of the pen motor points ''directly toward the thickest part'' of the egg (or sphere), as shown above.
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When the headstock is correction positioned, the shaft of the pen motor points ''directly toward the thickest part'' of the egg (or sphere), as shown above.
  
  
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https://cdn.evilmadscientist.com/wiki/eggbot/quality/14A.1.jpg
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When the headstock and tailstock are misplaced such that the pen motor is positioned too far to one side, you will find that (1) the pen cannot reach the surface everywhere that you would expect it to and (2) there will be some distortion of the print due to the misalignment. For more on positioning the motor see [http://wiki.evilmadscientist.com/Framing_and_Pen_Centering here].
 
When the headstock and tailstock are misplaced such that the pen motor is positioned too far to one side, you will find that (1) the pen cannot reach the surface everywhere that you would expect it to and (2) there will be some distortion of the print due to the misalignment. For more on positioning the motor see [http://wiki.evilmadscientist.com/Framing_and_Pen_Centering here].
  
  
https://cdn.evilmadscientist.com/wiki/eggbot/quality/14B.jpg
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https://cdn.evilmadscientist.com/wiki/eggbot/quality/13A.1.jpg
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A similar condition, in the opposite direction.
 
A similar condition, in the opposite direction.
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=== Horizontal position of the pen arm===
 
=== Horizontal position of the pen arm===
  
https://cdn.evilmadscientist.com/wiki/eggbot/quality/1G.jpg
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This photo shows the correct orientation for the distal pen arm and pen. Note that when the tip of the pen contacts the egg, the distal pen arm extends out straight and flat, down towards the center of the egg.
 
This photo shows the correct orientation for the distal pen arm and pen. Note that when the tip of the pen contacts the egg, the distal pen arm extends out straight and flat, down towards the center of the egg.
  
  
https://cdn.evilmadscientist.com/wiki/eggbot/quality/16B.jpg
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https://cdn.evilmadscientist.com/wiki/eggbot/quality/16A.jpg
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If, on the other hand, the pen arm is not horizontal when in the down position, it will cause the drawing to be skewed. (You will see similar types of issues when the pen arm backer is in the wrong position.)
 
If, on the other hand, the pen arm is not horizontal when in the down position, it will cause the drawing to be skewed. (You will see similar types of issues when the pen arm backer is in the wrong position.)
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=== Pen arm backer position ===
 
=== Pen arm backer position ===
  
https://cdn.evilmadscientist.com/wiki/eggbot/quality/1B.jpg
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When the distal pen arm is correctly positioned-- dead flat when it the pen tip is contacting the egg -- then the tip of the pen should point ''directly down'' and towards the ''thickest part of the egg''.  If it does not, that may indicate that the pen arm backer is in the wrong position and that you need to move the whole pen arm closer to, or further from, the pen motor.
 
When the distal pen arm is correctly positioned-- dead flat when it the pen tip is contacting the egg -- then the tip of the pen should point ''directly down'' and towards the ''thickest part of the egg''.  If it does not, that may indicate that the pen arm backer is in the wrong position and that you need to move the whole pen arm closer to, or further from, the pen motor.
  
This pen arm backer shown above is in the correct position, since the pen tip points directly down and towards the thickest part of the egg, when the distal pen arm extends straight out and flat. For more on positioning the pen, see [http://wiki.evilmadscientist.com/Framing_and_Pen_Centering our notes on framing].
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This pen arm backer shown above is in the correct position, since the pen tip points directly down and towards the thickest part of the egg, when the distal pen arm extends straight out and flat. (See also [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#framing this note] from our trouble shooting guide).
  
  
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https://cdn.evilmadscientist.com/wiki/eggbot/quality/9A-1.jpg
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If the pen arm backer is too close to the pen motor, then you may see this kind of distortion-- curvature of the letters with respect to the pen motor position.
 
If the pen arm backer is too close to the pen motor, then you may see this kind of distortion-- curvature of the letters with respect to the pen motor position.
  
  
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And similarly, when the pen arm backer is too far from the pen motor.
 
And similarly, when the pen arm backer is too far from the pen motor.
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===Bumping the pen arm===
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http://shop.emscdn.com/wiki/eggbot/quality/20A.jpg
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Here is the "diamond" test pattern, shown without any major quality issues (for reference).
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http://shop.emscdn.com/wiki/eggbot/quality/21B.jpg
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http://shop.emscdn.com/wiki/eggbot/quality/21A.jpg
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Here is the same pattern, but drawn with the EggBot misaligned such that the starting position of the pen arm was poor and the pen arm bumped into the tailstock of the EggBot while drawing. When the pen arm reaches the end of its range, it may bend and try to continue plotting there, or the motor may skip a step ("cog") and lose alignment.
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If you are having trouble with hitting the sides, check before plotting -- using the manual ("walk motor") commands if necessary -- to make sure that the pen arm has free travel over the entire range that you intend to use. You can also click [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#framing here] for more about alignment.
  
  
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===Map Projection===
 
===Map Projection===
  
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These two plots show an example file -- a circle inside of a square -- that are plotted on a (roughly) spherical ornament and on an egg.  And yet, they don't really look like that-- and this isn't really an "error."  While some of the distortion that you see is due to minor misalignments within the EggBot, a more major factor to consider is the change in geometry that comes from projecting our rectangular drawing file onto a non-flat surface.  In geometry, this is called a [http://en.wikipedia.org/wiki/Map_projection map projection], and the EggBot uses [http://en.wikipedia.org/wiki/Equirectangular_projection equirectangular projection], where distances are mapped directly to angles.   
 
These two plots show an example file -- a circle inside of a square -- that are plotted on a (roughly) spherical ornament and on an egg.  And yet, they don't really look like that-- and this isn't really an "error."  While some of the distortion that you see is due to minor misalignments within the EggBot, a more major factor to consider is the change in geometry that comes from projecting our rectangular drawing file onto a non-flat surface.  In geometry, this is called a [http://en.wikipedia.org/wiki/Map_projection map projection], and the EggBot uses [http://en.wikipedia.org/wiki/Equirectangular_projection equirectangular projection], where distances are mapped directly to angles.   
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On the sphere, the circle appears (more or less) spherical.  The square's top and bottom are straight (when photographed from this particular angle), but the other two sides (longitude lines) do not appear straight (when photographed form this angle).  On the egg, the distortions are more severe because the curvature is so different in the two axes.  We usually compensate for this (when drawing on eggs) by stretching the design horizontally by about 150%.
 
On the sphere, the circle appears (more or less) spherical.  The square's top and bottom are straight (when photographed from this particular angle), but the other two sides (longitude lines) do not appear straight (when photographed form this angle).  On the egg, the distortions are more severe because the curvature is so different in the two axes.  We usually compensate for this (when drawing on eggs) by stretching the design horizontally by about 150%.
 
(See also [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#ellipses this note] from our troubleshooting guide.)
 
(See also [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#ellipses this note] from our troubleshooting guide.)
 
(You can download the circle and square example file [https://cdn.evilmadscientist.com/wiki/eggbot/quality/calexamples/CircleSquare.svg here].)
 
  
 
== "Software" issues ==
 
== "Software" issues ==
  
 
=== Motor reversal issues ===
 
=== Motor reversal issues ===
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Doh! This occurred when the "Reverse motion of Motor 1 (pen)" was left unchecked when the egg was positioned so that its "fat" end was on the headstock. This can also happen when the "Reverse motion of Motor 1 (pen)" is checked, but the eggs "fat" end is in the tailstock.
 
Doh! This occurred when the "Reverse motion of Motor 1 (pen)" was left unchecked when the egg was positioned so that its "fat" end was on the headstock. This can also happen when the "Reverse motion of Motor 1 (pen)" is checked, but the eggs "fat" end is in the tailstock.
  
  
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This [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#mirrored mirrored image] of "Hello World" is the result of "Reverse motion of Motor 2 (egg)" being left unchecked while the "fat" end of the egg is in the headstock, and vice versa. If you leave both "reverse motion" setting unchecked, then you will get an [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#upsidedown upside down image].
 
This [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#mirrored mirrored image] of "Hello World" is the result of "Reverse motion of Motor 2 (egg)" being left unchecked while the "fat" end of the egg is in the headstock, and vice versa. If you leave both "reverse motion" setting unchecked, then you will get an [http://wiki.evilmadscientist.com/Eggbot_Troubleshooting#upsidedown upside down image].
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=== Timing issues ===
 
=== Timing issues ===
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This is the result of moving too fast.  The "Speed when pen is down" setting was set to 700 steps/s, which is usually too fast to create a neat drawing. The speed of the motor caused the pen to shake when drawing.
 
This is the result of moving too fast.  The "Speed when pen is down" setting was set to 700 steps/s, which is usually too fast to create a neat drawing. The speed of the motor caused the pen to shake when drawing.
  
  
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With the "Speed when the pen is down" setting set to 500 steps/s, while it is an improvement, the pen is still shaking.
 
With the "Speed when the pen is down" setting set to 500 steps/s, while it is an improvement, the pen is still shaking.
  
  
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This can happen when the "Delay after lowering pen" setting is set too low. The EggBot will start to commence the drawing before the pen has actually made contact with the egg, leaving gaps in your drawings.
 
This can happen when the "Delay after lowering pen" setting is set too low. The EggBot will start to commence the drawing before the pen has actually made contact with the egg, leaving gaps in your drawings.
  
  
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This is when the "Delay after raising pen" setting is set too low. The EggBot will start to move to the next destination before the pen is lifted off of the egg, leaving stray marks.
 
This is when the "Delay after raising pen" setting is set too low. The EggBot will start to move to the next destination before the pen is lifted off of the egg, leaving stray marks.
 
 
 
== Additional resources ==
 
 
For more about improving the results that you're getting with the EggBot, please see these additional pages on our wiki:
 
 
* [[Framing_and_Pen_Centering|Framing and Pen Centering]]
 
* [[The_Eggbot_coordinate_system|The EggBot Coordinate System]]
 
* [[Improving_precision|Improving precision]]
 

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