gorillamotors
Well-Known Member
- Joined
- Jan 18, 2009
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Nope. Just took it out of the dryer before the print.Does it make little popping noises? Almost looks like the PLA has absorbed a lot of moisture.
Tony
Is the tension on the extruder high enough? Looks like you might be slipping on the filament.
Yea I put it under my microscope and it does look like under extrusion in certain areas. I have also tried tightening it up and still this happens. That is why I bought the Bondtech BMG-M extruder. It has both of the gears connected and turning and not just like the one in the Prusa. I am still working on designing the adapter for the Bondtech BMG-M/Mosquito Magnum combo. It is time consuming.I tightened mine and it fixed the problem on my Prusa. That looks like under extrusion to me.
I think I might have found the problem. Along with the under extrusion problem above I was getting the problem of the extruder stopped extruding but continuing the print. I was reading a few of the other printer forums and it seems that the raspberry 3B+ and octoprint were the problems. So, I disconnected my 3B+ and used the SD card. I printed out six perfect PLA prints including five 6+ hour carbon PETG prints. I reconnected the 3B+ and the first 2 prints stopped extruding in the mid print. So, I am going back to using the SD card for now.
I just printed one yesterday with the Atomic Carbon PETG that I PMd you about. It took about 9 hours to print. Did not use the 3B+ but instead used the SD Card. It printed perfectly.That stinks. I have now has that Problem.
It is not resistance I measured. I measured temperature with a temp probe attached on the voltmeter.I don't think the resistance is linear with temperature so the resistance difference could indeed be the issue. I can't remember where and how this is calibrated but there will be an online temperature calibration guide somewhere which you should follow.
I talked to prusa and they said it would equate to a 36w heater instead of 40w. No big deal.@gorillamotors You said: "The resistance for a new 24v40w heater is 16.0 ohms and my current one is 14.9 ohms. Not enough to make that big of a discrepancy." How did you measure this resistance? This discrepancy could be enough for the temperature discrepancy.
Found my under extrusion problem. First was the thermistor. I had some Chinese thermistors that the resistance was 160K ohms and not around 100K ohms. The firmware uses #5 thermistor tables based on 100K ohms. This made the temps read 15-25C hotter than they actually were. Second was the heatbreak had a split at the neck junction. Fixed both of these plus I put some new thermal compound I just bought on the heatbreak (Thermal Grizzly Kryonaut Thermal Grease Paste). https://www.amazon.com/gp/product/B011F7W3LU/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
I just printed out 2 prints with the Atomic Carbon PETG and they were perfect.
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