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jeroendewijs

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  • 3D printer
    Ultimaker 2 (Ext
    +)

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  1. It is a often seen problem underextrusion. However, in this case most of the print is OK, but ust in the right upper corner, starting about half way the build plate, it starts to underextrude. Especially with a second print session on this printer. I already have set the flow to 150% in the first layer only, but it kept on happening that this corner was bad. What is the difference of this area with respect to the other area? I came up with a simple trick. The bowden tube is following the printhead in any direction. The curve of the tube differs with the position of the print head. But about half way the build plate, the bowden tube does not free follow the print head, it is a little blocked by the enclosure of the printer. This causes the tube to make a more stretched curve with the result that the filament flow is reduced a little by the space the filament gets inside the tube. This will cause underextrusion when the bowden tube hits the enclosure and the print head is moving away to the close right corner. What you want to achieve is a solid and steady filament flow controlled by the stepper motor of the printer, regardless the position of the printhead! The bowden tube is curving anyway but you want to have it the same in any circumstance. The blocking enclosure moment can be avoided to have the bowden tube ALWAYS fixed against the enclosure up to the top of the enclosure. So the bowden tube dus not start bending just above the stepper motor, no, it starts to bend just at the top of the printer enclosure. You can have it fixed with some kind of clamp, tape or whatever. It solved my problem,
  2. After some trouble with my Ultimaker 2(+) having unclear stops during printing I was looking for way's to find out what it caused. The problem reveiled itself with an Error01 Temperature sensor and a halt during printing. OR it did just stopped with printing, no message just the last printing status vissible but the printer was 'hanging' in that situation. So I could not confirm if it was the temperature sensor only or for example the mainboard having isseus. The regular described procedure of Ultimaker did not help me but seemed to confirm that the sensor was working fine. Most of the time, the printer, turned on and not running a job, did not show any errors or halts, the problems occurs when the printer is in printing modus. When you don't have electronic tools, multimeters or so, this is a simple way to roughly check a bad connectivity of the sensor to the mainboard. Hook the printer up to a computer (USB) running Cura and select the monitor tab. When the printer is connected you can see the bed and nozzle temperature. These valeus should reflect the actual temperatures. Now gently move the printer head around the printable square by hand, bend the bowden tube a little, move the sleeved wiring in several directions. Watch in the mean time the temperature valeu on the computer screen. I pulled also a little at the rear of the sensor where it appeared to have this signal break. In my case, suddenly the temperature was far too low, or extreem high (the cooler starts to run instantly as well). Then you can find a spot where it happens. In that case you can conclude that you have a bad cable (the sensor is still OK but unable to pass through good valeus) and you need to replace the sensor and cable together (as it is assembled as one piece). So take your advantage with this procedure to find the cause of the problem you face. Jeroen
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