What you need to know when upgrading from LW-PLA to LW-PLA-HT.Below you'll find all the information you need for a smooth transition to the all new more heat resistant LW-PLA-HT.

LW-PLA-HT contains a foaming agent which activates around 220C printing temperature (depending on the other settings used). In order to calibrate your 3D printer settings we developed a simple but effective 4 step process:

1. 3D print our calibration cubes.
2. Measure the wall thickness of the cubes.
3. Enter the values in our Excel file
4. Test print to confirm calculate values. Adjust flow setting until the part has strength you need.

Step 1.

You can download the files over at Printables click here.Beware that our pre-made calibration file is for printing at 0.2mm layer height using 0.4mm nozzle and 40 mm/s print speed. You can change these values to reflect your preferred settings.

Step 2.

After printing the calibration cubes, before removing them label each cube with the printing temperature as reflected in your file settings. You need to measure the thickness of the perimeter line at each side of the cube, use our excel file to process the data.

Step 3.

Insert the values into the excel file included in our files(click here)and have a graph plotted of the average values per cube, for each printing temperature.

We also plotted a secondary graph which shows you the relation beteen Material Flow [percentage] as a function of the printing temperature. In this graph you can easily see which percentage of flow you would need at a minimum to achieve the expected perimeter wall thickness. For this graph we used the following calculation:New Material flow = (100% Flow / (max perimeter width / perimeter widht at 210C))

Step 4.

Now you can select a part to test the calculated values you found for your set-up.

Usually the calculated flow value is lower then you would actually use for a sufficiently strong part. You might need to increase the flow rate with 5-10%. For RC planes we found 230C - 0.2mm layer height - 50/60% flow to result in sufficiently strong prints on our Prusa MK3s

Keep in mind if the pre-made files you bought have a very different print speed or layer height values then what you’ve tested with our calibration file, the value for the flow percentage will deviate. It would be best to repeat the calibration file with the key settings such as speed and layer height exactly the same as set in the files you bought.

Curious which values we found? Below you can find the values we found for the LW-PLA-HT colors.

LW-PLA-HT various colors - wall thickness vs print temperature. Sliced at 0.2mm layer height / 40 mm/s / 0.4mm nozzle.

Calculating the theoretical material flow percentage needed for a an extrusion width similar to the width when printed without foaming at 210c:

New Material flow = (100% Flow / (max perimeter width / perimeter widht at 210C))

* usually the calculated flow value is lower then you would actually use for a sufficiently strong part. You might need to increase the flow rate with 5-10%. For RC planes we found 230C - 0.2mm layer height - 50/60% flow to result in sufficiently strong prints on our Prusa MK3s

Keep in mind if the pre-made files you bought have a very different print speed or layer height values then what you’ve tested with our calibration file, the value for the flow percentage will deviate. It would be best to repeat the calibration file with the key settings such as speed and layer height exactly the same as set in the files you bought.

If you don't want to go through the process of calibrating your printer, because you bought pre-made Factory files or G-codes you can use the following tips&tricks to get a smooth transition to our LW-PLA-HT.

If the RC plane you bought includes pre made 3MF / Factory files then you have the possibility to adjust all relevant settings. We suggest adjusting the following settings:

First layer partially stuck on the plate. To prevent these issues we recommend the following settings.

• 1^stlayer print temp – 200/210C
• 1^stlayer flow – 100% flow (we’re not activating the foaming agent at these temperatures)
• 1^stlayer perimeter – 2 perimeters for additional strength.

Perfect flat part and easy to remove. You can down load our simplify3D template file here: LW-PLA-HT template factory file.

If the plane you bought includes pre-made g-codes only then you’ll have to adjust the flow rate manually using your 3D printer control panel. By how much you need to increase the flow rate depends on the flow rate which has been set in the file. It’s expected that you need to increase anywhere between 10-20% increased flow rate. Try printing a small part and measure the thickness of the extruded perimeter to see if this matches what it should be.

If we missed essential information in this article, please let us know at support@colorfabb.com

These video's show the difference in heat resistance between the original LW-PLA and our new and improved LW-PLA-HT.

- team colorFabb