Hello, I purchased two Hemera's for a set of printers and have ran into trouble with both. I have spent the last two days diagnosing intermittent skipping with the 1st Hemera and discovered something by watching all of the gears while extruding filament. The low pitched gear that meshes with the tensioner gear is intermittently slipping on the shaft. Actually, mine now just spins freely on the shaft. (video attached) Luckily I just so happen to have multiple Hemeras on my bench I dissembled a new one and this one, the low pitched gear is firmly seated on the shaft and doesn't spin independently from the gear reduction gear. I then assembled the known good Hemera and instead of getting silent intermittent slipping, I get grinding. I checked to make sure the heat-break was not interfering with the filament gear and I have correctly set the filament tension so I am all out of ideas.
I have installed on an ender 5. I am getting a grinding sound as well. I haven't read anything about making sure the heat break isn't interfering with the filament gear. Can you elaborate?
Hi Mitch, I looked at that and that could actually be happening. I will dissemble mine again and check. If it is, I will try and use some really thin shims to back the heat break off just a touch to see if that helps.
Made sure the heat break was not interfering with the extruder gears and also upped the Vref a bit with no change at all. Both of my new Hemeras are doing the exact same thing. I've reached the limited knowledge I have.
I just finished installing my new Hemera on Ender 3 and I'm experiencing this exact issue. It's not extruding at all, and using Pronterface to extrude filament results in a similar sounding grinding/vibration to your video. Am I going to need to dissasemble the Hemera to confirm there's some kind of defect? Are there any E3D guys who help out on these forums? Edit: I've tried increasing the tension on the extruder arm to have the white block flush with the black arm, I've calibrated my PID settings, done basically everything from Teaching Tech's Hemera install guide:
I had an issue with a Hemera not extruding earlier today. The first thing I did was to relax the tension screw and check that I got filament out of the nozzle when I pushed it in by hand, to make sure there wasn't a blockage in the heat break or nozzle. Have you checked that? My issue turned out to be the motor current setting, not the Hemera.
Appreciate this turned out to be a current setting, but I agree with this. I tend to use lower tension than the guide suggests. I recommend starting with the tension low/off and gradually increasing it whilst extruding to find the best setting. Also try increasing the temperature a little to see if it makes any difference. I also agree with checking for blockages. If you have been printing with the retraction set too high (over 2mm), for example, hot filament may have been pulled into the cool section of the extruder.
