Installed the new Ubis metal hot-end today. Adjusted retraction to .4mm before starting. Heated to 210C tried to extruder 10mm. Nothing. Just the drive gear grinding PLA. Raised heat to 230C, a drop of PLA came out. Tried manually pushing., it takes tremendous pressure to get tiny amounts if filament. I got maybe 5mm total.
Stumped.
Anyone else having problems with this new head?
Maybe there was some debris in there to start with also those temps seem a touch to hot depending on the PLA involved.
If you manually press the PLA in the extruder, releasing the clip of course, does it extrude?. Could be an obstruction, or your temp sensor is not reading the hot end properly. System says 230c when it is really only 195c. Have you taken an external temp check to see if you are really getting 230c?
Did you plugged in fan into 12V?
Any luck? Perhaps check for clogs by disassembling. If it’s a total fail, let me replace it and get it Carl for failure testing. Lots of good reports from users, but two clogs so far… Yours and one other that says it was his fault. We want 100% success though!
Brook
Fan is plugged in and running. Temp probably ok. Checked with IR, on outside red tape, about 160c. Will run a 2nd test tonight after dinner. Manual pushing was extruding but it took tremendous pressure (holding up gantry so it doesn’t break) to get a couple mm out at maybe 1mm/sec.
Does feel like a clog. Guess it’s time for a hot disassembly. I’ll try to avoid burning my fingers on the allen wrench like Brook in the video.
First while cold I slid a 1.5 mm Allen wrench in to see where solid PLA was. It was at top edge of heater.
Next heated to 210 and removed tip.
Cooled and examined. Tip filled with PLA, feed tube had about 2 mm of PLA. Heated with tip off, pushed the PLA out of tube. In was soft molten so upper part of heated tube seems to work at 210.
Reattached tip while 210. Put 100mm length piece of PLA in and attempted to push out filament. No retracting at all, just push. A small blob, indian bead size was all I could manage. Bumped heat up to 230, still no go. Checked temp with IR gun, was 160 at bottom. Pushed to 250 and still can’t push PLA.
Just took it up to 260 and could push a bit more out. The PLA coming out was not liquid - probably more like 155. So this seems like heater/thermistor problem. I don’t want to go high than 260C @Brook_Drumm I guess I better send it back for fail test.
BTW bottom temp measured with IR is 175 when idling at 250C. The IR isn’t that far off reading the old Ubis.
My sensor is messed up for some reason because of the new hot end I think IDK @Brook_Drumm
@Van_Robbins do you mean the Z probe or the temperature probe?
Z probe
@Van_Robbins Try removing the new little jumper board and plugging probe back in directly. Don’t operate hot end though, just check if led turns on at bed.
Maybe the jumper board isn’t seating well on your printrboard.
I fixed it
Way to go!! There is an alternate way to plug in without the board. Wish I would have thought of it sooner. See instructions at http://help.printrbot.com
