Tag: 3dprinting

Bowden tubes are flexible tubes that connect the extruder and the hot end of a 3D printer. They are used to guide the filament through the printer and prevent it from bending or tangling. Bowden tubes can improve the print quality and speed of a 3D printer, but they can also cause some problems if they are not installed or maintained properly. It doesn’t happen frequently, but when there is a problem with the tube it can cause problems and be difficult to diagnose.

One of the most common issues with Bowden tubes is clogging. Clogging can occur when the filament gets stuck inside the tube due to friction, heat, moisture, or dust. Clogging can affect the extrusion rate and quality of the print, and can also damage the extruder motor or the hot end. To prevent clogging, it is important to use high-quality filament that is compatible with the tube diameter and material. It is also advisable to clean the tube regularly with a cleaning filament or a compressed air blower. Additionally, it is recommended to use a tube cutter or a sharp knife to cut the tube ends at a 90-degree angle, as this will ensure a smooth and tight fit with the fittings.

Another common issue with Bowden tubes is kinking. Kinking can happen when the tube bends too much or too sharply, creating a permanent deformation in the tube wall. Kinking can reduce the inner diameter of the tube and increase the friction and resistance for the filament. This can lead to under-extrusion, stringing, or layer shifting in the print. To prevent kinking, it is important to use a tube that has enough stiffness and flexibility for the printer setup. It is also advisable to avoid bending the tube more than necessary and to secure it with cable ties or clips to prevent it from moving too much during printing.

A third common issue with Bowden tubes is wear and tear. Wear and tear can occur over time due to the constant movement and friction of the filament inside the tube. Wear and tear can cause the tube to lose its shape, smoothness, and elasticity, which can affect its performance and durability. To prevent wear and tear, it is important to replace the tube periodically when it shows signs of degradation, such as cracks, splits, or discoloration. It is also advisable to use a tube that has a high abrasion resistance and a low coefficient of friction, such as PTFE or Capricorn tubes.

If you have ever used a 3D printer, you know that there are many settings that you can adjust to customize your prints. But many of these settings are not independent of each other. In fact, changing one setting can have a significant impact on other settings and the quality of your prints. I will explore how some of the most common 3D printer settings affect each other and what you need to consider when tweaking them.

Layer Height
Layer height is the thickness of each layer that the printer extrudes. It affects the resolution, print time, and strength of your prints. Generally, lower layer heights result in higher resolution, longer print time, and stronger prints. Higher layer heights result in lower resolution, shorter print time, and weaker prints. However, layer height also affects other settings such as extrusion width, temperature, and cooling.

Extrusion Width
Extrusion width is the width of the filament that the printer extrudes. It affects the accuracy, surface quality, and strength of your prints. Generally, higher extrusion widths result in more accurate, smoother, and stronger prints. Lower extrusion widths result in less accurate, rougher, and weaker prints. However, extrusion width also affects other settings such as layer height, temperature, and cooling.

Temperature
Temperature is the temperature of the hotend and the heated bed that melt and adhere the filament. It affects the adhesion, flow, and quality of your prints. Generally, higher temperatures result in better adhesion, smoother flow, and less warping. Lower temperatures result in worse adhesion, rougher flow, and more warping. However, temperature also affects other settings such as layer height, extrusion width, and cooling.

Cooling
Cooling is the amount of airflow that cools down the filament after it is extruded. It affects the shape, detail, and quality of your prints. Generally, more cooling results in better shape retention, finer details, and less stringing. Less cooling results in worse shape retention, coarser details, and more stringing. However, cooling also affects other settings such as layer height, extrusion width, and temperature.

3D printer settings are not isolated from each other. They work together as a set to determine the outcome of your prints.

One of the factors that affects both speed and quality of your print is the acceleration of your 3D printer. Acceleration is the rate of change of speed, and it determines how fast your printer can move from one point to another. Too high acceleration can cause vibrations, ringing, and loss of accuracy. Too low acceleration can result in longer print times and lower productivity.

So how do you calculate the optimal acceleration for your 3D printer? There is no definitive answer, as different models and settings may require different values. However, there are some general steps you can follow to find a good balance between speed and quality.

  1. Start with the default acceleration value that your printer manufacturer recommends. You can usually find this in the firmware settings or the slicer software.
  2. Print a test model that has sharp corners, curves, and details. You can use a calibration cube, a benchy, or any other model that suits your purpose.
  3. Examine the print quality and look for signs of over- or under-acceleration. Over-acceleration can cause ringing, ghosting, or overshooting on the edges of the model. Under-acceleration can cause blobbing, stringing, or under-extrusion on the corners and curves.
  4. Adjust the acceleration value by 10% increments and repeat steps 2 and 3 until you find the best compromise between speed and quality. You can also adjust other parameters such as jerk, speed, and flow rate to fine-tune your results.
  5. Enjoy your optimized 3D prints!

How to recognize when 3D printer temperature is too low?

The temperature of the nozzle is crucial for the quality and strength of the printed object. If the temperature is too high, the filament may burn, clog the nozzle, or ooze excessively. If the temperature is too low, the filament may not melt properly, resulting in poor adhesion, under-extrusion, or warping.

So how can you tell if your 3D printer temperature is too low? Here are some signs to look out for:

  • The filament does not stick to the build plate or to the previous layers. This can cause gaps, holes, or cracks in the printed object.
  • The filament curls up or bends at the tip of the nozzle. This can cause stringing, blobs, or zits on the surface of the printed object.
  • The filament snaps or breaks easily. This can cause jams, clogs, or extruder skipping.
  • The printed object has a rough or matte surface. This can reduce the aesthetic appeal and smoothness of the printed object.

If you notice any of these signs, you may need to increase your 3D printer temperature by a few degrees and try again. You can also use a temperature tower test to find the optimal temperature range for your filament and printer model. A temperature tower is a simple model that prints at different temperatures along its height, allowing you to compare the results and choose the best one.

Different filaments have different melting points and require different temperatures. For example, PLA typically prints well at around 200°C, while ABS needs around 230°C. You should always follow the manufacturer’s recommendations and adjust accordingly based on your printer’s performance and environment.

Infill is the internal structure that supports the outer shell of a 3D printed object. It can affect the strength, weight, and appearance of the print.

There are many types of infill patterns, such as grid, honeycomb, triangle, gyroid, and more. Each one has its own advantages and disadvantages depending on the application and the desired properties of the print.

Grid infill is one of the most common and simple patterns. It consists of horizontal and vertical lines that form squares. Grid infill is easy to print and provides good strength in all directions. However, it can also be heavy and use more material than other patterns.

Honeycomb infill is another popular pattern that mimics the structure of a bee’s honeycomb. It consists of hexagonal cells that are connected by thin walls. Honeycomb infill is lighter and more efficient than grid infill, as it uses less material while providing similar strength. However, it can also be more difficult to print and require more processing power.

Triangle infill is a pattern that uses equilateral triangles as the basic unit. It is similar to honeycomb infill in terms of efficiency and strength, but it has fewer connections between the cells, which can reduce printing time and noise. However, it can also be less stable and prone to deformation.

Gyroid infill is a complex pattern that creates a continuous surface with no gaps or holes. It is based on a mathematical function that produces a wavy shape. Gyroid infill is very strong and flexible in all directions, as it can absorb stress from different angles. However, it can also be very slow to print and require a lot of memory.

If you are a 3D printing enthusiast, you might have heard of the term “all-metal hot end”. But what is it and why should you consider upgrading to one?

An all-metal hot end is a hot end that is made completely of metal, as the name implies. This puts it in contrast to the standard hot end that typically comes with 3D printers. A standard hot end is made of a heating block right above the nozzle, a heat sink for drawing away the excess heat, and a coupling that connects to the extruder. The coupling usually contains a PTFE tube that guides the filament into the melt zone.

The main advantage of an all-metal hot end is that it can handle much higher temperatures than a standard hot end. This means that you can print with a wider range of materials that require higher extrusion temperatures, such as Nylon, PET+, Tritan, and Polycarbonate. These materials are stronger and more durable than PLA and ABS, which are the most common filaments for 3D printing.

Another advantage of an all-metal hot end is that it has a smaller and more controlled melt zone. This results in cleaner retractions and less oozing, which improves the print quality and reduces the need for post-processing. An all-metal hot end also has fewer parts and connection points, which makes it easier to maintain and less prone to jams. Moreover, you can easily swap between different nozzle diameters to suit your printing needs.

However, an all-metal hot end is not without drawbacks. The main issue of using an all-metal hot end is the phenomenon known as heat creep. This is when the heat from the nozzle travels up the heat break and reaches the heat sink, causing the filament to soften before it reaches the melt zone. This can lead to clogs, under-extrusion, and poor print quality. To prevent heat creep, you need to ensure that your all-metal hot end has adequate cooling, such as a fan or a water-cooling system.

A Z seam isn’t really a “problem,” so much as it is just something that happens in 3d printing when you use an FDM printer. It is a line or a seam that is created along the Z-axis, where the printhead stops and moves up to print the next layer. This can cause a slight gap, a blob, or a zit on the surface of your print, especially on smooth and round objects.

There are several ways to fix or hide the Z seam in your 3D prints, depending on your slicer settings and your model geometry. Here are some of the most effective methods:

  • Adjust retraction settings: Retraction is when the extruder pulls back the filament slightly to prevent oozing during non-printing movements. By improving your retraction settings, you can reduce the amount of material that leaks out at the end of each layer, which can minimize the Z seam. You can adjust the retraction distance, speed, and extra prime amount in your slicer to find the optimal values for your printer and filament.
  • Change Z seam alignment settings: Z seam alignment is how your slicer decides where to place the Z seam on your model. You can choose between random, shortest, user-specified, or sharpest corner options. Random alignment will scatter the Z seams all over your model, making them less noticeable but also less consistent. Shortest alignment will place the Z seams at the closest point to the previous layer, reducing print time but also creating a visible line. User-specified alignment will let you choose a specific location for the Z seam, such as the back or the front of your model. Sharpest corner alignment will place the Z seams at the sharpest corners of your model, hiding them in the details.
  • Reduce print speed: Print speed affects how much pressure is built up in the hotend during printing. If you print too fast, you may have more material oozing out at the end of each layer, creating a bigger Z seam. By reducing your print speed, you can lower the pressure and improve the flow control of your extruder, resulting in a smoother surface finish.
  • Enable coasting: Coasting is when your slicer stops extruding a little bit before the end of each perimeter, letting the remaining pressure in the nozzle push out the filament. This can help reduce oozing and stringing, as well as Z seams. However, coasting can also cause under-extrusion or gaps in some cases, so you need to experiment with different coasting distances and volumes to find the right balance.
  • Enable linear advance: Linear advance is a firmware feature that adjusts the extruder pressure based on the print speed and acceleration. It can help improve print quality by compensating for over-extrusion and under-extrusion at different speeds. By enabling linear advance, you can also reduce the Z seam by having more consistent extrusion throughout each layer.

There are several factors that can cause weak infill in 3D prints, such as:

  • Infill density: This is the percentage of material used to fill the interior of a 3D printed object. A higher infill density means more material and stronger infill, while a lower infill density means less material and weaker infill. A general rule of thumb is to use at least 20% infill density for most prints.
  • Infill pattern: This is the shape of the material used to fill the interior of a 3D printed object. There are many types of infill patterns, such as grid, honeycomb, triangular, gyroid, etc. Some infill patterns are stronger than others, depending on how they distribute the material and how they connect with the outer shell of the object. For example, honeycomb and triangular patterns are stronger than grid and lines patterns.
  • Infill speed: This is the speed at which the nozzle moves while printing the infill. A higher infill speed means faster printing time, but it can also cause under-extrusion, which means not enough material is extruded from the nozzle. Under-extrusion can result in weak and stringy infill, as well as poor adhesion between the layers. A lower infill speed means slower printing time, but it can also ensure better extrusion and stronger infill.
  • Infill line width: This is the thickness of the material used to print the infill. A higher infill line width means more material and stronger infill, while a lower infill line width means less material and weaker infill. The optimal infill line width depends on the nozzle size and layer height you are using. A general rule of thumb is to use an infill line width that is equal to or slightly larger than your nozzle size.

How to Fix Weak Infill?

If you have diagnosed that your 3D prints have weak infill, you can try some of these solutions to fix it:

  • Increase your infill density: This is the easiest way to improve your infill strength. You can adjust your infill density in your slicer software before printing. As mentioned earlier, a minimum of 20% infill density is recommended for most prints.
  • Change your infill pattern: This can also make a big difference in your infill strength. You can choose a different infill pattern in your slicer software before printing. As mentioned earlier, some patterns are stronger than others, so you may want to experiment with different options and see what works best for your print.
  • Lower your infill speed: This can help prevent under-extrusion and improve your infill quality. You can adjust your infill speed in your slicer software before printing. A good way to find the optimal speed is to start with a low value and gradually increase it until you see signs of under-extrusion or poor quality.
  • Increase your infill line width: This can also help increase your infill strength by using more material. You can adjust your infill line width in your slicer software before printing. As mentioned earlier, a good way to find the optimal value is to use an online calculator or a test print.

If you own a 3D printer that runs on Klipper firmware, you might have spent a lot of time tweaking your printer.cfg file to get the best performance and quality. But what if something goes wrong and you lose your configuration? Or what if you want to try a different setting but don’t want to lose your previous one? That’s why it’s important to make backups of your Klipper printer configurations.

A backup is a copy of your printer.cfg file that you can save on your computer or a cloud service. You can use a backup to restore your configuration in case of an error, or to switch between different configurations for different purposes. For example, you might have a backup for printing with PLA and another one for printing with PETG. Or you might have a backup for printing fast and another one for printing slow.

Making backups of your Klipper printer configurations is easy and can save you a lot of trouble in the future. Here are the steps to do it:

  1. Connect to your Raspberry Pi via SSH or use the web interface of OctoPrint or Mainsail.
  2. Navigate to the folder where your printer.cfg file is located. Usually, it is in /home/pi/klipper_config.
  3. Copy the printer.cfg file and rename it with a descriptive name. For example, printer_pla.cfg or printer_fast.cfg.
  4. Repeat step 3 for each configuration you want to backup.
  5. Transfer the backup files to your computer or a cloud service using SCP, FTP, or any other method you prefer.

Now you have backups of your Klipper printer configurations that you can use anytime. To restore a backup, just copy the backup file to the folder where your printer.cfg file is located and rename it to printer.cfg. Then restart Klipper and enjoy your printing!

We had a sudden weather change last week here in Texas. The high temperature for the day went from about 65 to about 90 pretty suddenly, and I hadn’t really thought about the implications to my printer. The environment where I keep my printer is “somewhat controlled.” I normally let the HVAC shut off after around 4:00 PM. I also still have my enclosure on the printer, which I need to do to maintain enough heat around the 3d printer.

When the HVAC shut off, the temperature rose pretty quickly in the room and built up too much heat and the printer went into emergency shut down. I was about 30 hours into a 40 hour print, so I didn’t want to start over if I didn’t have to.

I get an error on my phone when this happens and then the machine shuts down. Here is how I was able to recover and what I could have done to prevent the shut down in the first place.

Step #1 – Make sure the heaters stay on. I went to my printer controls and turned on the bed heater to give me some time to work so that the part would not move.

Step #2 – Go to log file to find exact location of nozzle when it shut down. In Klipper, it is pretty easy to find by simply searching through the log files.

Step #3 – Download gcode file and open in code editor. This is tricky. I had to remove all of the gcode that had already been printed, but make sure that each of the setting codes remained. This was pretty time consuming. I had to find the exact spot that the log said the nozzle was when it shut down. Then I had to reupload this modified gcode file so that the printer would resume from there.

Prevention – What I should have done was to remove the enclosure so that it wouldn’t trap all of the heat in. I also should have left my HVAC system on so that the environment would stay cooler.

Note: whenever possible, try to leave the area where your printer homes clear. That way, if you ever have an emergency shutdown your machine can home without having to remove the part.