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http://reprap.org/wiki/CoreXY
Re: G&C Printer - 8 years ago
Looks very interesting! I'm currently using a titan extruder on the original design, but with a similar 'front hanging' hot end arrangement to the new version. This meant I had to extend the bed platform and move the bed forward to compensate for the change in position of the print head. It's a bit of a shame that you've decided to change the size of the frame, the current size fits absolutelyby simon_smithson - CoreXY Machines
Re: G&C Printer - 8 years ago
QuotefilipeCampos At the moment i starting the design a new version of this printer that will use two 9mm rails for the y axis and one 12mm rail for the x. The structure and bed will be the same, i will simply remove my actual corexy mechanism and replace with the new one. The main problem of this new version it will be probably necessary to have access to a cnc to cut 3 to 5 aluminium pieces. Sby simon_smithson - CoreXY Machines
Re: G&C Printer - 8 years ago
As far as I'm aware the extruders are only right handed. Ironically the printed bracket that they sell with the extruder, or that you can download and print yourself has a bolt pattern that is almost IDENTICAL to that on the top of the carriage. It's even exactly the same width. Very strange. I've just mocked up the idea of hanging the hot end off the front of the carriage and it looks good.by simon_smithson - CoreXY Machines
Re: G&C Printer - 8 years ago
Funnily enough my Titan extruder arrived yesterday. There are no mounting holes on the extruder itself, instead you mount via a printed plate sandwiched between the extruder and stepper. My current plan is not to use the hole in the middle of the carriage as, by default, the extruder wants the hotend directly interfaced with the extruder. I've also had endless issues with the gap between extruby simon_smithson - CoreXY Machines
Re: G&C Printer - 9 years ago
QuoteNosmo Vref is the maximum current setting on a ramps or compatible board (using a potmeter), a MKS Sbase doesn't have Vref potmeters but the max current is set via the config.txt file. My extruder setting is 280 steps/mm on 1/32 micro stepping (had the extruder running yesterday and did a calibration test). The extruder is a Chinese MK8 contraption. Are you running direct drive or Bowden?by simon_smithson - CoreXY Machines
Re: G&C Printer - 9 years ago
Tightening/loosening yes. Vref - not sure what you mean. Running at 90 steps per mm at 2 amps currently (2 amps being the rated current of my extruder stepper motor). Reckon I'm going to have to lower that though as the thing is running very hot and looks to have distorted the extruder mounting already. Hot and heavy is a bad combo for stepper motor supported by plastic mounts in my experienby simon_smithson - CoreXY Machines
Re: G&C Printer - 9 years ago
Tightening/loosening yes. Vref - not sure what you mean. Running at 90 steps per mm at 2 amps currently (2 amps being the rated current of my extruder stepper motor). Reckon I'm going to have to lower that though as the thing is running very hot and loos to have distorted the extruder mounting already. Hot and heavy is a bad combo for stepper motor supported by plastic mounts in my experiencby simon_smithson - CoreXY Machines
Re: G&C Printer - 9 years ago
In which case, If I do ever manage to get it printing well I'll share my config with you! Biggest issue I'm currently having is with the extruder. I'm currently using a single direct drive. It seems to go wildly from under to over extruding. Not entirely convinced that having the print spool at the bottom of the machine and a length of PTFE tubing is the best approach for me, so I might shiftby simon_smithson - CoreXY Machines
Re: G&C Printer - 9 years ago
My build is now pretty much complete and I'm in the midst of the painful process of calibration and configuration. My hardware list looks pretty much the same as yours @Nosmo - we're both using the MKS SBASE Smoothieware board I think. Could you please share your config with me?by simon_smithson - CoreXY Machines