i just wanted to inform you about my problems with brittle filament.
I have printed with leapfrogs MAXX Economic PLA (white) which is as brittle as normal PLA.
After printing some parts the filament broke at the steppermotor (without me noticing) aswell as breaking at the end of the teflon tube that leads to the spool holders.
This means that there was filament stuck in the tube, so far not that much of a problem.
But (!) for absolutly no reason the teflon tube that connects the spoolholder and the extrusion motor (where the filament is stuck in) has an inside diameter that is very much bigger then the filmament diameter (1,75mm).
This means that the filament that got stuck can’t be removed with other filament that you push through one end.
The stuck filament creats so much friction, so that it’s not possible for the extrusion motor to pull the filament that i fed though the additionally.
So make sure, that you pull all filament out of the tube when changing it. If you have this problem you have to disassemble both side pannels (white) aswell as the cover just below the belt that connects the Z rods.
Finally it would be very good if a leapfrog official sees this so that the printers that will be produced have a teflon tube with an inner diameter of 2mm or similar. A tube where more then one line of filament fits in just provoces problems like the one i had.