Honestly my qu-bd extruder/hotend gave me no issues till I changed filaments and then it was all down hill
there are several things that need to be done with the qu-bd first and probably one of the biggest is they use a stainless steel mounting plate
change this to an aluminum plate and 80% of your troubles are gone (it transfers heat better) instead of holding it
Second someone did a barrel mod and this is the final part of the fix but inserting ptfe tubing into the barrel limits you to about 245-255c for temp
I did goto a j-head mount, and I tested the MK v-b, a ceramic counter part and finally the metalmagma (trinity labs and jollygrimreaper co-op design)
they all work great but a few things to note:
the Mk v-b is available at hotends.com he is apparently the designer and comes with heat resistor and thermistor, with shipping it was about 70.00
the ceramic is better over the MK v-b because the body is ceramic and not made from peek, it cant be harmed by hi-temps like peek can
Ceramic also handles getting rid of the heat faster, if you get the 1.75mm version it does have a piece of ptfe tubing in it which will again limit your temp
to around 245-255c before the ptfe starts to melt. Its 50.00 with shipping I paid about 56.00 and it arrived in 3 days from the netherlands I believe, it comes
with the thermistor and a heat cartride. You can find them here
http://www.2engineers.com/shop/Now for the Crim-della-crim of hotends, I kid you know if your not using one you should be
there is a 3mm and a 1.75mm version
you can get them in all metal or with a ptfe liner in them
the all metal verison can run at extremely high temps, i'm about to start printing with polycarbonate which has a temp of 265-300c
at this time trinity labs only has the all metal 3mm version but dont worry, its the one I got
I put a piece of 3.1mm OD x 2.4mm ID ptfe tubing in mine and it prints 1.75 pla and abs perfect everytime, this does limit my temp
but all I do is remove the ptfe and I can print with 3mm filament at any temp, the cooling on it is crazy efficient, I had to lower my fan
speed to keep the temp where I wanted it.
the 3mm metalmagma is available here:
http://trinitylabs.com/products/trinity ... emp-hotendIf you want a all metal 1.75 then dont worry all version of the magma head are available here
http://3d-industries.myshopify.com/collections/hotendsif you have the 3mm version of the metal magma then this is the ptfe I orded for mine to use 1.75mm filament
http://www.ebay.com/itm/321114275718?ss ... 1439.l2649it arrived in about 3-4 days, I was supprised.
NOTE: this tubing is a direct replacement for the ptfe in the 1.75mm version of the ceramic hotend as well
I run pla and abs on my ord-bot and i'm printing with a feedrate of 175-200% all the time (metalmagma hotend)
with 1.75 and 3mm filaments. This thing is so great I ordered a second and i'm setting up dual extruders on my ord-bot
it truely is trouble free printing
if anyone wants the ceramic 1.75mm hotend I will let it go for 55.00 shipped and I will include a foot of extra ptfe in case you over heat it