brnrd wrote:For 1.75 mm feed, you don't really need any gears with a NEMA 17 motor. I don't even use gears with 3 mm feed with the 0.35 mm J-head and I can extrude ABS up to 150 mm/min or faster with it. That's in terms of the 3 mm feed.
Bart, what configuration are you running the J-head? Is it on an ORD BOT?
gyrogearloose wrote:There are MK2 J-head hotends for sale on ebay for $52US incl. shipment:
http://www.ebay.com/itm/New-RepRap-3D-P ... 43b324a431
I have just ordered one to try.
tmccafferty wrote:brnrd wrote:For 1.75 mm feed, you don't really need any gears with a NEMA 17 motor. I don't even use gears with 3 mm feed with the 0.35 mm J-head and I can extrude ABS up to 150 mm/min or faster with it. That's in terms of the 3 mm feed.
Bart, what configuration are you running the J-head? Is it on an ORD BOT?
What brand thermal epoxy do you recommend?
brnrd wrote:tmccafferty wrote:brnrd wrote:For 1.75 mm feed, you don't really need any gears with a NEMA 17 motor. I don't even use gears with 3 mm feed with the 0.35 mm J-head and I can extrude ABS up to 150 mm/min or faster with it. That's in terms of the 3 mm feed.
Bart, what configuration are you running the J-head? Is it on an ORD BOT?
I think you might have meant that question for me. The J-Head I'm using is a Mk V-BV, which is the latest version, from hotends.com. I use it on a Mendel, Prusa2 and a Hadron. It doesn't really make a difference what printer it's on. I'm using Marlin which allows one to autotune the PID parameters. This is critical to avoid large temperature overshoots which can damage the PEEK thermal insulator.
tmccafferty wrote:brnrd wrote:tmccafferty wrote:Brnd, what is the rest of the extruder that you are using with the j-head on the Hadron? I am having fits with the qu-bd. I have done Bering mods and that helped tremendously with drive force and I printed good for about 10 minutes. Then the extrusion got very fine and I couldn't even push the pla through the nozzle by hand. I think the heat had backed up the tube. I don't have enough experience yet to know much about diagnosing it. Would love to get something that would work reliably.
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