rhino_aus

I have tried. It is quite high right now, any less and the filament will slip. I will check this but when I took the head apart yesterday it seemed completely normal. Yes. That replacement part but I didn't instal the I2K as I only intended to print PLA and it was not recommended for sub 240C printing AFAIK. I have it, but I haven't put it in. I will try this but I can't imagine what it would change.

I have had a UM2 for the longest time and have done everything I possible can to get it to print a print without failing. I have replaced the hot end with an Olsson block, high temp PTFE coupler, 35W heater, new temp sensor, new fan shroud, |Robert| extruder, new extruder knurled gear, recalibrated the E steps, calipered my filament to 0.01, and even tried wrapping the nozzle in Kapton tape and Atomic cleaned the nozzle more times than I can count and yet *still* the printer fails with this setup: 35mm/s, 0.15mm layer height, 0.4mm nozzle, 230C, PLA. The extruder motor just keeps skipping back and the print fails miserably. What steps do I try before I throw this $5000 waste of money off a bridge

Okay so I fixed the problem! I bought a replacement for my knurled sleeve (the Aurarum Mk7 part) then I recalibrated the e-steps for the larger gear and now there is 0 slippage of the filament extruding with no load or at high speed! Excellent! I believe my stock gear was somehow either not knurled properly or had become worn down over time such that the grip on the filament was too low to be effective. I can now easily extrude at 60mm/min which is the equivalent of printing 0.15mm layers with a 0.4mm nozzle at 105mm/s at 230C. Thats about 6.3mm^3/s. Fairly happy with that. I can reach 10mm^3/s extrusion but there is ticking of the extruder motor, although the actual length that is extruded isn't terribly affected. I will retry the extrusion test vase at some point.

Okay so I did some more testing and it seems that the motor is not the issue. Commanding an extrusion with the filament feeding through the hot end or not causes the stepper motor to rotate the exact same distance, as such it is not a motor problem, but the filament slipping on the knurled gear. I shall investigate solutions to this

I have already upgraded my printer with the |Robert| feeder, an Olsson block hot end with a 30 watt cartridge, and 3dsolex high temp PTFE coupler. Is the included stepper motor different to the UM2 motor? My setup should be able to print at much higher speeds. Even at 35mm/s effective extrusion rate (20mm/min extrusion -> 35mm/s @ 0.4 width, 0.15 layer height) there is under extrusion in the 100mm command.

EDIT: I fixed the problem! I bought a replacement for my knurled sleeve (the Aurarum Mk7 part) then I recalibrated the e-steps for the larger gear and now there is 0 slippage of the filament extruding with no load or at high speed! Excellent! Okay so today I have been trying to get my printer dialed in and I am coming across a problem with the extrusion that my searches cannot resolve. My printer is an Ultimaker 2 that I have replaced the hot end with an Olsson block with 30 watt heater, and have replaced the extruder with the one designed by |Robert|. Here is an example picture of the second layer. I level my bed with a dial indicator and deliberately did it too low (as you can clearly see) with the first layer to ensure the spacing between print and nozzle was right for the second layer. It's pretty clearly under extruding. My filament is fine. My slicer settings are fine. Printing an object in vase mode I get wall thicknesses between 0.37 and 0.40mm. Taking advice I decided to calibrate my e-steps with the normal 100mm method. This is where things get confusing for me: - If I extrude with the bowden tube disconnected (ie not through the hot end = no load) the extrusion is perfect. - If I extrude with the bowden attached, the extrusion distance is function of the extrusion speed. Extruding at 90mm/min extrudes 68.3% of the expected distance, 60mm/min give 86%, and 30mm/min gives 90.4%. As far as I can tell, the filament is not slipping (EDIT: FORESHADOWING!) and I would not expect it to with this extruder and hot end. I am watching it up close and there is no sign of slipping or grinding. This tells me that the motor is not turning as much as it is is being commanded to under load, with less movement as load increases If this is the expected result, what speed do I use to calibrate my e-steps? If this is not the expected result, what do I do to make the stepper motor move as commanded when extruding? It doesn't feel right to use any of these values since then the extrusion under no load will be too much.

Scale large files really needs to be turned off by default. I just wasted an entire print because the model was scaled down by ~3% when imported into Cura 2.1.3 then rotated to fit onto the print bed. It makes no sense for this option to be enabled unless you specifically wanted it to be enabled.

HI all; It seems like the new version of Cura doesn't support dragging and dropping in STL files. This works in 15.04.5 and is basically a necessary feature. Having to use the open dialog box is such a slow down and inconvenience, particularly when files are downloaded in Chrome or in a Zip. I can't just drag them into Cura anymore. Please fix!! Ryan

Okay I did a factory reset of the print and now its working... :S

Cura was set to UltiGcode in machine setting and generated this gcode: ;FLAVOR:UltiGCode;TIME:4958;MATERIAL:13747;MATERIAL2:0;NOZZLE_DIAMETER:0.400000;NOZZLE_DIAMETER2:0.400000;Layer count: 88;LAYER:0M106 S255G0 F9000 X81.398 Y83.907 Z0.250G0 X81.798 Y83.708;TYPE:SKIRTG1 F1200 X82.986 Y82.521 E0.16794G1 X89.416 Y82.521 E0.81094 When I tried changing to RepRap Marlin/Sprinter just then it was like this M190 S70.000000M109 S210.000000;Sliced at: Wed 18-05-2016 23:49:42;Basic settings: Layer height: 0.25 Walls: 1.2 Fill: 20;Print time: 1 hour 14 minutes;Filament used: 2.011m 17.0g;Filament cost: 0.77;M190 S70 ;Uncomment to add your own bed temperature line;M109 S210 ;Uncomment to add your own temperature lineG21 ;metric valuesG90 ;absolute positioningM82 ;set extruder to absolute modeM107 ;start with the fan offG28 X0 Y0 ;move X/Y to min endstopsG28 Z0 ;move Z to min endstopsG1 Z15.0 F9000 ;move the platform down 15mmG92 E0 ;zero the extruded lengthG1 F200 E3 ;extrude 3mm of feed stockG92 E0 ;zero the extruded length againG1 F9000;Put printing message on LCD screenM117 Printing...;Layer count: 88;LAYER:0M106 S255G0 F9000 X81.398 Y83.907 Z0.250G0 X81.798 Y83.708;TYPE:SKIRTG1 F1200 X82.986 Y82.521 E0.02457G1 X89.416 Y82.521 E0.11865 Should the UltiGCode look like that? It seems to be missing all the initialization stuff?

No, the machine simply does not pause to purge, as soon as the bed reaches the right height, it starts printing.

Hey guys and gals; I've been printing with my UM2 for a while now and its always purged a bunch of filament before the print starts but now for some reason it doesn't. Did I accidentally change something in my settings or in Cura? I updated Cura and firmware to no avail. Thanks, Ryan EDIT: Factory reset of the printer has fixed the issue... wierd.

A simple suggestion that I would really like to see is to have an input to change the travel speed on the bottom layer. Often when I am printing the first layer, I print at 20mm/s for maximum adhesion to the build plate but I find that the super quick 150mm/s jumps to other places on the plate will drag the filament and pull it off. Having a slower travel speed, say 50mm/s, on the first layer would mitigate these issues. Another alternative would be to have an adjustable, lower acceleration (but not deceleration) value for the first layer. Starts off slowly to ensure it doesn't pull the filament off then accelerates to the normal speed. If this functionality already exists please let me know

For me it is one of the ones on the side. I have printed a new shroud which allows me to run them at 50% and so the rattling isn't as bad; but its still dang annoying

Woo! I had the exact same issue as renderbouy and found that with the new fan shroud I printed the nozzle was unable to get up to heat; reducing the fans to half fixed the problem