Dave -
Ok, I think there are two, maybe three separate issues here.
1) High resistance when pushing the filament by hand is actually pretty normal. In the normal course of printing, the pressures in the head are really high. So that may not be anything to worry about, as such.
2) The bulges on the end of your removed filament are from the bowden tube lifting out of the teflon piece, I suspect, rather then from the teflon lifting up and creating a gap underneath. You need to make sure the bowden is fully seated, and can't lift up and down once the clip is secured. (See, my recommended procedure http://umforum.ultimaker.com/index.php?/topic/4586-can-your-um2-printer-achieve-10mm3s-test-it-here/?p=40399.)
3) The lip on the teflon piece is a common problem. Heat and time can cause the plastic to creep into the nozzle block opening, restricting the filament movement enough to contribute to under-extrusion.
4) Regarding the heated bed... do you get any error messages, or does it just not heat up? Check the wires going into the back of the heated bed (especially the thicker power wires), and also check at the electronics board end. You might also check the connection between the terminal block on the heated bed and the bed itself.
Recommended Posts
dgsharp 0
Well I put everything back together and left a print running at 210C. I came back after 9 hours or so (24h print) and halfway through one of the parts had popped off the build platform and it was printing air spaghetti. But spaghetti is better than caramelized PLA. I went to try re-printing it using the new raft option and.... my heated bed never got hot. (Presumably the heated bed died mid-print, causing one of the parts to let go of the glass.) So it seems like I have another issue in addition. Will update as I get a chance to uncover things. I haven't noticed any loose or discolored wires anywhere yet, but need to tear things apart more to look closer.
http://www.sadtrombone.com/
(I went to that web page and the ad was for an Ultimaker2. How it mocks me!)
-Dave
Link to post
Share on other sites