**Been printing American made Fiberglass filled PC and Carbon filled PC for a few weeks now. ** The repeated issue, no matter which type of material (carbon or glass), a wad of material collects on the point of the nozzle, then gathers more material until the wad is pressed upward toward the hex of the nozzle over 15 minutes, then gathers around the hex and upward until after around 30 minutes, the weight and changing shape of the wad causes it to fall onto the print. This is the only material I’ve ever printed that has this issue (I’ve printed almost everything else).
I suspect that PC is attracted to heat, and so it catches to the nozzle in tiny amounts as the nozzle moves over previous print, and melts towards the heat…towards the nozzle. My only solution so far has been picking wads off the nozzle with a tool at 15-30 minute intervals. You can see all the pieces laying about the bed, picked from the print over a couple hours.
I’m printing at 290c with bed at 110c - 120c.
0.5mm Hard Steel Nozzle, Lines are set for 0.4mm high and 0.6 wide.
I’ve ranged speeds from 30mms to 60mms, and prefer 45mms for most sections of the print.
No cooling fan on the nozzle, set at zero.
I’ve found the best flow rate to be at 80% for both Fiberglass and Carbon filled, even though they each have different mix ratios.
I have a flame retardant-high-heat resistant clear (slight yellow tint) plastic sheet hood over the entire printer to create a heat chamber.
I’ve printed around 1kg now, and haven’t found a solution to the wading material on the nozzle, other than picking it off every so often while printing.
These are production components for canoes and kayaks. Extremely rigid, durable components are being completed in very nice finish. This is a fantastic machine! Fiber filled polycarbonate is far more appropriate for this application than fiber filled Nylon…I’ve tried kilos of NylonX.
I’m wondering if printing at higher nozzle temps such as 335c, might reduce the wading.
Wondering is printing on a much hotter bed, such as 150c, might work. I realize that these temps are beyond the capability and design of my machine, but I wonder if that is the absolute solution.
Your experience? Ideas?