Prologue :


The models used in the following print example can be downloaded from our website.

Look for [ATOM Test Print Files] under the Downloads section, find the cart STL file in the downloaded .zip file and don't forget to download the latest KISSlicer with pre-configured setting for ATOM 2

Before we get started , please double check that your machine is well inspected in every single point:

ATOM Printer Inspection


Print Example 1 -Positioning and Orientating Objects


The model used in the following print example can be downloaded from our website.
Look for [ATOM Test Print Files] under the Downloads section, find the cart STL file in the downloaded .zip file.


Here are the key factors to a successful and clean print, starting with the most important factor:

 

1. Assembling the printer properly by following every step of the manual.

2. Tailoring the form of the model for printing: Model while avoiding
    overhangs and extremely thin features.

3. Rotating the object to the optimal orientation in the slicing software.
    Although ATOM 2 can print overhangs at close to flat angles without
    support, it is still a good idea to minimize overhangs for a perfect print.
    Printing supports is also an option for large overhangs, but it costs extra
    time, material, is difficult to remove and makes the supported surface
    rougher.
4. Tuning the slicer settings to be most optimal for the model.

 

This print example involves learning techniques in determining the best orientation for the model for printing.

fig.1 - Most Optimal Orientation                                                        fig.2 - Not The Most Optimal Orientation


fig.1 - Most Optimal Orientation                                                        fig.2 - Not The Most Optimal Orientation

 

The cart in (fig.1) is the most optimal orientation because it has the best combination of the following favorable conditions:


1. It offers more if not most surface area in contact with the print bed, giving it a more stable foundation.

2. It has the least extreme angles of overhangs.

3. Most of the weight is at the lower end, giving it a lower and more stable center of gravity so it will not tip over.

If the cart is rotated on its back (not pictured), there will be ample surface area in contact to the print bed, and the overhangs on the two arms will not be a problem. However, the biggest problem is the very large flat 90° overhanging surface from the groove cut in the back. The orientation of (fig.2) is also printable, but there is less surface contact to the print bed and the arm overhangs are 60°, which are more difficult to print than 30°. Since the 0-90° bridge on the belt tie is very small and it exists for both orientations, the orientation of (fig.1) is most favorable.
 

 Fig. 3  Cross Section of the Cart                                                      Fig. 4 Sharp Corners May Warp


 Fig. 3  Cross Section of the Cart                                                      Fig. 4 Sharp Corners May Warp

 

When printing sharp edges on thin walls (fig.3), the edges may warp and lift due to heat constantly being applied to the area. This problem can be mitigated by increasing the number of loops in the slicer as well as turning on the side blower fans to rapidly cool down the edge.

Tips:
Clean the residual filament on hotend's nozzle can prevent affect sharp edges of model.
(Using preheat function wait for 5 minutes and use paper napkins to wipe the residual filament before printing.)

 

  Fig. 5 - First Layer of Small Bridge                                                 Fig. 6 - First Layer of Small Bridge


  Fig. 5 - First Layer of Small Bridge                                                 Fig. 6 - First Layer of Small Bridge


As mentioned earlier the small unsupported bridge on the belt tie is unavoidable.
However because it is only a short bridge it poses no problem for ATOM 2 to print without support as long as the bridge is constructed with loops and the side fansare on. The first layer of the bridge when sliced with the proper settings should look like in (fig.6).

 

Print Example 2 - Small Objects With Small Features



The model used in the following print example can be downloaded from our website. Look for
[ATOM Test Print Files] under the Downloads section:

(Find the Eiffel Tower STL file in the downloaded .zip file)
 

fig.1 - Example of Poor (Left) vs Optimal (Right) Slicer Settings And Their Results


fig.1 - Example of Poor (Left) vs Optimal (Right) Slicer Settings And Their Results

When printing small objects with small features, these factors should be considered:

1.  Amount of cooling and time for cooling on each layer.

2. The amount of time the heated hotend spends above     the printed layer.

3. The wipe function causing more heat contact.

4. The first layer surface area is too small.

5. Broken geometry of the 3D model.




1. Amount Of Cooling And Time For Cooling On Each Layer                                  

   When printing small layers, the continual presence of the hotend above the printed layer will build up heat on the    printed layers, causing undesirable warping. To counter this, there must be extra cooling applied to the printed  
   layer, as well as time for the layer to cool. Activate the side blower fans on ATOM 2 (pg.28 Fan/Cool) to cool
   down the printed layer.      

 KISSlicer Side Fan Introduction (Mastering Atom CH -2 Material tab)
 


2. The Amount Of Time The Heated Hotend Spends
    Above The Printed Layer

 



Activate the side blower fans on ATOM 2 (Material Tab - Fan/Cool) to cool down the printed layer, and activate the prime pillar or create a dummy model next to the tower (Support Tab - Prime Pillar) to move the hotend away from the printed layer. Also make sure the [Min Layer]  duration is not set too long, otherwise the hotend will move slower than it needs to. Set it to 3 seconds or less. The last method worthy of mentioning is to increase the overall print speed.

Loops: 25 [mm/s]                      
Solid: 25 [mm/s]
Sparse: 25 [mm/s]

 

fig.2 - Eiffel Tower Model Sliced Result in KISSlicer With Brim And Prime Pillar ([Raft] & [Prime Pillar] are opened)


fig.2 - Eiffel Tower Model Sliced Result in KISSlicer With Brim And Prime Pillar ([Raft] & [Prime Pillar] are opened)

3. The Wipe Function Causing More Heat Contact

When printing small objects or small features, the [Wipe]  function may be a cause to further warping. Disable [Wipe]. If the model has both large and small features then set the [Min Jump] at a higher value.

 

 

fig.3 - Successfully Printed Eiffel Tower Model

fig.3 - Successfully Printed Eiffel Tower Model

4.The First Layer Surface Area Is Too Small

If the surface area of the first layer contacting the print bed is too small, then set [Brim] to 5mm or more to increase surface area and grip.

 

 

 


5. Broken Geometry Of The 3D Model

Sometimes the STLs generated from 3D CAD programs have holes, broken surfaces or other errors that may cause KISSlicer to produce a bad GCODE file. In the CAD program, make sure the geometry is solid without holes and errors, or try exporting with slightly different tesselation or welding settings. Other programs like Meshmixer
or the Microsoft 3D Model Repair Service can possibly fix errors in the STL file to make it at least printable.

 

Slice your model of the Eiffel Tower in KISSlicer while keeping all the points mentioned previously in mind. 3D printing involves trial and error, and it is accepted that first prints may not be perfect or even a total failure. But with experience and the right techniques you can achieve better prints with less attempts.

 

Print Example 3 - Hand Model

While we do not have this model available as a 3D model, it serves as a good study model that covers many slicing and printing considerations.

Hand.png

Inspection 01 :
There are several individual sections of the model on the same layer, meaning the hotend will jump between each one when printing.

To prevent stringing, the functions [Wipe]
and [De-String] should be enabled. Also ensure that [Trigger] and [Min Jump] are appropriately set at lower values.

 

Inspection 02 :
The base of the model is extremely uneven and it has almost no surface area contacting the print bed. [Support] must be enabled in this case and make it denser for good measure. Grid [Raft] can also help expand the base and increase stability.
 

Inspection 03 :
These small features need more cooling and time to cool. Enable the side fans.

 

Inspection 04 :
The entire hand can be printed with [Sparse Infill] enabled or as [Hollow] . The entire skin should be printed with loops. Ensure that the [Loops go from Inside to Perimeter] is enabled.


Inspection 05 :
Since only this area needs support, a [Support Z-Roof] can be set to disable support generation above this area.

 

Print Example 4 - Dimensional Accuracy Test

The model used in the following print example can be downloaded from our website.
Look for [ATOM Test Print Files] under the Downloads section:

(Find the 50x50 Vase STL file in the downloaded .zip file)
 

 


Print the 50x50 Vase with infill type set to [Vase] and set the skin to be all consisting of loops. 

 

 


 

Measure the length and width of the printed model with a precise caliper. There are two things to look out for:

1. The length and width of the printed object vs the 3D model dimensions.
2. The length measurement versus the width measurement of the printed model.
 

                   fig.1 - Original 3D Model Dimensions                                    fig.2 - Printed Model Measurements Are Off                                                           


                   fig.1 - Original 3D Model Dimensions                                    fig.2 - Printed Model Measurements Are Off                                                           

 

If the length and width are both uniformly larger or smaller than 50mm by an unsatisfactory amount, then the firmware can be edited to compensate this difference:

1. Use the Arduino software to open the [Marlin.ino] file.

2. Select the [configuration.h] tab in the Arduino software.

3. Search for the term [DELTA_DIAGONAL_ROD]

4. Use this formula to set the new [DELTA_DIAGONAL_ROD] value:

New Value = Old Value x (Measured Printed Dimension / 3D Model Dimension)
eg. New Value = 224.24 x (48 / 50) = 215.2704

5. Save the file and upload firmware to ATOM 2 via USB.

 

 

If there is a difference between the length and width dimensions of the printed model itself, then it indicates that the assembly was not done precisely.
An inspection of all structural components is recommended.
Make sure there are no gaps between all extrusions and their connected pieces.
Make sure all steel ball joints are fastened to the end.
Make sure the carriages are flush and secure to the slide seat and that the slide rails are centered to the 2040 extrusions along their entire lengths.

                                                                            ATOM Printer Inspection