i will try a manual version after my actual print is finished. If successfull i will share the steps and hopefully there will later be an automated process, if there are no failures.
i will try a manual version after my actual print is finished. If successfull i will share the steps and hopefully there will later be an automated process, if there are no failures.
The nozzle reservoir appears to be smaller in diameter than the bowden tube, I have no problems with pulling the filament with the "plug" at the end which is formed as the nozzle reservoir. I can measure the "plug" next time I change.
As far as I can think of, this can absolutely be automated. The extruder have to pull pretty fast to replicate my hand pulling, but it might work really good. Auto-change. That would be a great feature!
I am using the UM Original btw.
Yup, this works great, I've been doing it for a while on the UM2 now. It was one of the reasons I wanted to be able to completely release the filament at the feeder when I started designing my feeder. It can be done on the stock feeder as well, but it's a bit more tedious.
What I did was to heat the nozzle to print temp and then use the move material command to fully prime the nozzle (since the UM2 firmware retracts quite a bit at the end of a print). Then I turned the printer off so that the feeder stepper would stop holding the filament in place. Next you just wait for the filament to cool down (turning the printer back on and going into the "Heat nozzle" menu you can check the temp) and then pull quite hard on the filament.
One downside is that since the roller is still pushing hard on the filament it will sometimes break off the tip of the filament so you have to fish it out of the housing.
One downside is that since the roller is still pushing hard on the filament it will sometimes break off the tip of the filament so you have to fish it out of the housing.
Once you get half way out through the bowden it might make sense to let it cool for 30 seconds and *then* pull it the rest of the way. At 90C the filament is still soft and I'm not surprised it has trouble when it gets to the feeder.
Interesting discussion. I am changing filament daily (now that I ordered 5m of the entire Faberdashery filament assortment)
With the default material change procedure, strands of filament tend to end in a big blob that won't pass the extruder on the way out. That's very annoying.
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gadgetfreak 7
I think this is an excellent idea. We've been using "the Atomic method" (based on user MostlyAtomicBob who first explained it) which is similar with the 90C trick.
However, isn't the nozzle reservoir a much bigger diameter than the Bowden tube?
I can't recall the dimensions for UM1 and UM2 resevoir respectively...it would be super cool if it could be automated in the UM2 filament change process.
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