Hey all,
My original head broke and I’d been looking at moving to a Bowden so I’ve bought my self a J-head, I’ve put it together and tested a print and it… well it’s printing better than the old one…
It seems like the extruder isn’t feeding correctly. Is there a different feed rate or something like that I’ll need to punch in to get it going correctly?
Any advice on how I can understand stuff it?
Thanks everyone!
Drew
Nice
Is the slicer set to wrong filament size? Like you’re using 1.75 but slicer is set to 2.85?
Hey @Jeff_DeMaagd ,
Shouldn’t be… Unless they sent the wrong part…
I moved from a 1.75 direct feed to 1.75 Bowden J-Head…
Any benefit in shortening the filament tube? I’ll post a photo of the whole setup in a sec.
(be kind, its not fully assembled cos troubleshooting…)
Did you change extruder drives? Different gear ratio?
Ahhh damn it, didn’t even think of that!
That’s probably it!
Any advice on fixing that?
You would have to change the steps per mm in your machine firmware. Some LCD setups have that but some machine control boards require reloading the firmware.
Cheers, I’ll go hunting.
Mind if I ask you any questiong if I run into trouble?
I don’t know your machine, board or anything. If you’ve never touched your firmware yet then there’s a lot to learn.
@Drew_Hopcroft if you are using Marlin firmware I think you can adjust your steps per mm with a simple M code command. Don’t have to dig through your firmware and reflash that way
Disconnect bowden tube from extruder. Find a software package or send gcode commands to send to extruder 100mm. Measure and see if you get 100mm. If not, then measure. There is an equation on the internet to find steps based on those measurements. Google extruder calibration. Good luck!
Thanks guys, looks like I’ve got a bit of learning ahead of me 
Im slowly upgrading all the parts from the original cheap Prusa I bought, I’ve got a ramps 1.4 in the post, so be good to understand it all before that arrives.