The silver thumb screw at the back of the tool head is the tension adjustment. There is a little window on the left side of the extruder through which you can see a nut that indicates the amount of tension on the filament idle bearing. We do not recommend dropping below 50% tension for 1.75mm filament. The tight spacing around the thumb screw was necessary in order to have the rest of the components line up properly.
Cura LulzBot Edition
Cura LulzBot Edition works great with the LM Nano and only requires a couple of changes.
A solution for Cura LulzBot 2 is coming soon!
Two ways to use Cura LulzBot edition
You can use the quick print settings, then bring them into expert view by selecting Expert>Switch to full settings…
When prompted, click "yes" in the profile copy pop up.
Once in expert view, change the filament diameter to 1.75mm.
Using 0.25mm and 0.8mm hotends: switch to expert view by selecting Expert>Switch to full settings…then select the "advanced" tab and change the nozzle diameter to .25mm or .8mm accordingly.
When using the 0.25mm and 0.8mm hotends with the quick print settings in Cura LulzBot Edition you may need to tweak the print setting for best results as these profiles are tuned for a .5mm nozzle.
You may also update any profiles you have made yourself in the same way.
Printing Flexible Materials
The LM Nano uses 1.75mm filament, which means that flexible materials are even more likely to find interesting ways of going anywhere but out the nozzle of you tool head. The Titan extruder, which the Nano is based on, does have a fully guided filament path, yet still faces challenges printing flexible materials. Below are some recommended settings to get you started.
Print speed: 13mm/s
Retraction Distance: 1.25mm
Increasing retraction seems to be the main cause of jams, this can be compensated for by using coast and wipe setting in Simplify3d to reduce stringing. Unfortunately there are no coast and wipe settings in Cura LulzBot Edition.
Retraction Speed: 5mm/s
Print Temperature: We experienced great success adding 5ºC to the highest recommended print temperature for the given material.
Simplify 3D profiles are available for download on our website. There are separate profiles for each of our hotends. Additionally, each hotend has a standard, semi-flex, and flex profile. You can find these profiles here.
When loading filament with the .25mm hotend in Simplify3d make sure to reduce the extruder speed to around 2mm/s in the Machine Control Panel. If material is fed through too quickly, the small nozzle diameter will cause to much back pressure in the extruder and may cause a jam and or stripped filament.
Using composites and flexible materials like ColorFabb WoodFill and XT-CF20, and NinjaTek NinjaFlex and SmeiFlex is NOT RECOMMENDED with the 0.25mm HOTEND. The particles in composite filaments can clog and jam small diameter nozzles. Additionally, the small diameter nozzle creates a great deal of back pressure causing flexible materials to buckle and jam. We do include composite and flex profiles for the 0.25mm hotend, but these are for EXPERIMENTAL PURPOSES only. If you wish to try them, use at your own risk. We have had some success slowing the print speed to around 25mm/s for composites.