Hello Iv been reading the forum for the last little while but first actual post. Im having lots of trouble with the hot end / extruder. First I used an A2a hot end which pushed itself apart completely stripping the threads in the Teflon. Then a tried a hot end from a polish ebay seller who seemed to have a good design that didn't rely on plastic threads to hold the pressure. This new hot end takes the pressure no problem but the extruder jams about 1-2 minutes of printing. If I push the plastic it gets progressively more and more difficult until I can't push it through anymore. Iv played with temperature ,gone from 220C all the way upto 265C with abs, both abs I got from repraper.com and from A2A. I then tried to print PLA and ran into the exact same issue (iv tried temps from about 180-235 for pla - no luck.) What I figure is that the plastic is melting too soon and I'm seriously considering machining an all brass hot end with water cooling if I can't get this issue resolved.... all help appreciated. https://reprap.org/forum/read.php?1,167041,167041#msg-167041 Sat, 12 Sep 2026 00:41:53 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,167041,167200#msg-167200 https://reprap.org/forum/read.php?1,167041,167200#msg-167200 Also running a fan on the PTFE portion of the hot-end will keep the filament cool till it reaches the metal portion.
PLA expands when it is heated, so you want to avoid this expansion in PTFE section to avoid clogging.
If you get a clog in PTFE, there is no point pushing it in as the problem will persist. It is best to pull the filament out before the problem gets worse.]]> peddiparth General Tue, 20 Nov 2012 19:28:35 -0500 https://reprap.org/forum/read.php?1,167041,167047#msg-167047 https://reprap.org/forum/read.php?1,167041,167047#msg-167047 flying freak General Mon, 19 Nov 2012 23:48:40 -0500 https://reprap.org/forum/read.php?1,167041,167044#msg-167044 https://reprap.org/forum/read.php?1,167041,167044#msg-167044 jamesdanielv General Mon, 19 Nov 2012 23:40:37 -0500 https://reprap.org/forum/read.php?1,167041,167041#msg-167041 https://reprap.org/forum/read.php?1,167041,167041#msg-167041
Iv been reading the forum for the last little while but first actual post. Im having lots of trouble with the hot end / extruder. First I used an A2a hot end which pushed itself apart completely stripping the threads in the Teflon. Then a tried a hot end from a polish ebay seller who seemed to have a good design that didn't rely on plastic threads to hold the pressure.

This new hot end takes the pressure no problem but the extruder jams about 1-2 minutes of printing. If I push the plastic it gets progressively more and more difficult until I can't push it through anymore. Iv played with temperature ,gone from 220C all the way upto 265C with abs, both abs I got from repraper.com and from A2A. I then tried to print PLA and ran into the exact same issue (iv tried temps from about 180-235 for pla - no luck.)

What I figure is that the plastic is melting too soon and I'm seriously considering machining an all brass hot end with water cooling if I can't get this issue resolved....

all help appreciated.]]> flying freak General Mon, 19 Nov 2012 22:43:02 -0500