Between that and swapping out the noctua fan I had been using for the extruder for the E3D fan that came with the Hemera I was able to get through a 3 hour print today without a clog/jam/stoppage. I'm currently running at 1000mA on the extruder which is about 75% of the max current listed in the spec sheet. ![]() I've tried running between 800-1000 mA and don't see an appreciable difference in the motor temperature (40-45C by thermocouple on multimeter) or performance. That's only 3 mm3/s for reference, and most normal hot ends are good for 5-10 mm3/s. It actually caused the extruder to skip audibly when attempting to extrude PLA at 5 mm/s with a 200C hot end. I've got a Duet board that allows me to specify the current in the software settings so was able to verify that 700mA is definitely too low. Thanks! I've been doing some reading on the Creality machines to try and help a friend with an Ender 5 that uses the CR10S board and it sounds like those machines are set around 650-700 mA for the stock stepper which is definitely on the low side for the motor that E3D provides. Turning it off altogether did result in stringing, but setting it to just 0.3mm (as compared to the 3mm that it was set to before) eliminated most of it. So I did still have retraction on (explains the results). My printer is a CR 10S Pro, so it's not the same printer, but maybe the same fundamentals apply:ĮDIT: Also I just found out that my slicer (Slic3r Prusa Edition) was overriding my extruder retraction settings on my filament settings. Here are a couple links with more info about adjusting the current. No idea if that theory is correct, but I am seeing much better results now. My theory is that the spring was too loose, causing the filament to slip, and tightening the spring caused the extruder stepper motor to miss steps/seize up because it couldn't get enough current. disable retraction (I think it can be enabled, but I disabled it altogether and still have no stringing)īefore this point, I tried several time to tighten/loosen the spring. ![]() I don't think it should have any impact, but in my case there was a marked improvement with this change) reverse the way the stepper motor was plugged in and set it to inverted in marlin config (no why this helped. adjust the supply current to the extruder I was able to make a few changes which significantly helped things in my tests: ![]() I've discussed this with a friend who also recently upgraded to a Hemera and he's seen similar issues with his machine (Ender 5) and it looks like there's a few other people complaining of similar issues in this and other forums as well. It also seems like a heat creep issue, but sticking a thermistor into the heatsink or between the motor and backing plate only shows 40-45C (this is admittedly not a great way to take a reading, but it's all I have). ![]() It prints great for a while and then stops extruding.Īt first I thought my nozzle was clogging, but after messing around with it some more I'm pretty sure that's not the case as I can't extrude after a jam, but if I manually pull the material out and feed it back in it's fine for a few more minutes. This happened three times so I switched to a newer roll of 3DSolutech PLA (200C hotend) and saw the same issue as with the Raptor PLA. I then switched to some old MakerGeeks Raptor PLA (235C hotend) and started to have issues with the extrusion stopping suddenly a few hours into a print. After the upgrade I printed for about 20 hours using PETG without any issues (240C hotend). I just upgraded my AM8 with a Hemera hotend and I'm running into some trouble with extruding PLA.
0 Comments
Leave a Reply. |