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  1. I stil have quite a bit of 2.85 mm filament, but yes I am considering to switch completely to 1.75 mm. Found the Bondtech feeder as part of the Ultimaker QR 3 Upgrade kit... so I didn't realise there was also a 1.75 mm version. I will think about it.
  2. Smaller nozzles might indeed be very helpful to increase precision, but it doesn't solve the issue with my feeder (minimum extrusion volume). 🤔 Or would you recommend switching to 1.75mm filament when printing with smaller nozzles.
  3. Could you explain that in some more detail, it sounds interesting. If I understood your point, the printer will retract the filament by one step if the line printed requires less filament than one feeder's step to prevent excess material on the print plate/object. Let's say I want to print two separate lines, each of them requiring an amount of material that is just 50% of the minimum feeder' step. For printing the first line the filament is moved by one step. Supposing I print at a speed that exceeds the rate at which the material flows out of the nozzle (what would that be aprox?), I can stop printing by retracting the filament by one step at the end of the line. This step's material is then only used by half, so for the next line, one step will just extrude the other half of the volume that is left in this step. Did I get the principle right? It might work like this in theory, but doesn't the print cores have some internal volume of melted filament within them whicht might affect such extrusion of such tiny bits of material?
  4. I am considering changing the original feeder on my Ultimaker 3 printer to a third-party Bondtech QR 3.0 feeder. At the first glance, it doesn't seem to make a huge difference regarding its precision (369 steps/mm original, 492 steps/mm Bondtech). I have heard though, that the Bondtech feeder works a lot better with stiffer filaments (e.g carbon fibre added filament). Would anyone be willing to share their experience with the Bondtech QR 3 feeder on a Ultimaker 3? Does anyone use the Bondtech feeder with 1.75 mm filament? I knwo it's designed for 2.85mm, but I have heard the original feeder can deal with 1.75mm filament, so I might do both modifications at once.
  5. You're using 2.85mm filament, right? I am considering switching to Bondetech 3.0 but would like to print with 1.75mm filament and I'm not quite sure if it works. The original feeder seems to work with 1.75mm filament (thinner tubes provided...).
  6. That's good to know, thanks for your help! Both the microsteps and s slightly smaller feeder sleeve diameter make sense. As the feeder sleeve has some sort of bumps on its surface (probably to increase grip) I might have measured the outer diameter (including the bumps) rather than the actual diameter of the feeder sleeve. With 369 steps/mm, the 250 Mikron nozzle and a layer height of 60 Microns I would get a single line minimun printing lenght of ((2.85mm/2)^2*3.1416) * (1mm/369steps) / 0.250mm / 0.06mm = 1.15 mm per step That seems a lot more realisitc than the 20mm I calculated in the first place and might fit the detailness of your model prints. I was hoping to create even smaller structures, but probably that's how it is 🤔 I will print some more test lines...
  7. Does anyone have any experience regarding the minimum resolution I can print with? Any help or ideas shared are highly appreciated 🙂 According to the UM3 manual, the layer resolution is: Thus, I expected the minimum printing resolution to be x: 0.25mm; y: 0.25mm; z: 0.06mm However I'm not getting good results for my fine structures. I then had a look at the Ultimaker 3 feeder: Moons 17HD6482_01N stepper motor (200 steps/round) powering a 11-tooth gear Transmission to a 36-tooth gear powering 10mm diameter feeder wheel These characteristics lead to a minimum filament feed lenght of: 1/200*11/36*10mm*3.1416 = 0.048mm / step For the 2.85mm diameter filament, I thus assume a minimum extrusion volume of 0.048mm*(2.85mm/2)^2*3.1416 = 0.306mm³ per feeder step. For a line printed with the 250 Mikron nozzle and 60 Mikron layer height I get a single line minimun printing lenght of 0.306/0.250mm/0.06mm = 20.4mm per feeder step This value seems quite high I think. Am I really limited to print such long lines when it comes to a small printing layer hight? Is there maybe an errror in my calculations and assumptions? Does anyone have any experience what happens when the amount of required material for a structure is below the minimun volume to be extruded by one feeder step? (e.g. printing a single line, 5mm long, 60 Mikrons layer height, 0.25mm nozzle) I have the impression that in this case, the feeder stays still and the print core moves along the printing path, but doesn't extrude/print significant amount of matrial. However, I couldn't confirm my suspicion so far. Probalby I need to check my printed structures under a better microscope to measure width and hight of my line/layer.
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