|Not exactly 100% fill anymore...|
Right away I discovered that the aluminum nozzle was loose and not tightly fastened to the peek anymore. My guess it's caused by the repeated heating and cooling of the print head. I think it's the MakerBot manual that states you need to heat the print head before tightening the screw so that's something to keep in mind.
|The PTFE tube (below) has expanded quite a bit.|
The inside of the tube has expanded as well and makes a reservoir where the plastic can bunch up. This is probably the main reason the flow of plastic isn't as good as it should be.
|Underside of the print head holder showing the MDF fitting around the PEEK.|
There's also quite a lot of surface connection between the PEEK and the aluminum increasing the heat transfer even more. One way to lessen this would be to let the nozzle screw into the PEEK instead of the other way around. As I don't have access to a lathe I won't be able to test that theory, but someone else hopefully might.
I've had to cut my bowden tube twice now the remaining part is to short to work leaving my print head out of business. Since I'm expecting a replacement head from QU-BD soon I figure I might just as well start preparing my printer. The "old" setup don't have room for the new print head so I'll have to remove the MDF and fabricate a new y-axis. I'm thinking using more aluminum (same as in the print bed), but we'll see. I'll also move the y-motor off the carriage to reduce the weight as much as possible.