seriously no one had anything to say about any of this?

On Wed, 5 Dec 2018, Jake wrote:

> last night at sudoroom i did some things to get solder paste flowing from the
> TAZ 3 3d printer.
>
> i brought in a compact air compressor and adjusted its power switch to click
> off around 100 PSI (since it was failing to reach its design pressure in a
> reasonable amount of time and we only need like 40-50PSI for solder paste)
>
> i'm not sure if it's still working because it cut out apparently due to heat
> the last time i was running it, but possibly just because of duty cycle.  It
> needs a fitting installed into the outlet to plumb it to the solenoid.
> Fittings are in the box behind the printer and there's teflon tape in the
> "tape" box on the shelves in sudoroom.
>
> i installed a three-port solenoid on the 3d printer which plugs in instead of
> the extruder resistor / temperature sensor.  It contains a 47KΩ resistor to
> simulate a thermistor (to avoid a fault code) and it wires the nozzle heater
> wires to the three-port solenoid (which is rated at 24VDC matching the
> printer's power supply)
>
> I piped the 3-port solenoid to a syringe and mounted a syringe holder on the
> print head assembly in a reasonable place.  A syringe of solder paste is in
> the
> sudoroom fridge and can be used.  Needles of various sizes are in the
> cardboard
> box behind the 3d printer.
>
> the air compressor's outlet needs to be plumbed to the flexible black hose
> going to the 3-port solenoid.  The solenoid needs to be mounted to the print
> head (a twist-tie should work).
>
> unfortunately the 3D printer's firmware seems to be cycling power to the
> nozzle
> resistor when a temperature is selected, probably because of PID parameters,
> so
> we will have to look for a set of commands (or modified firmware) to activate
> the solenoid properly during the dispensing process.  This printer doesn't
> seem
> to have wires for a print head fan, which is how we connected the solenoid in
> past implementations of this setup.  There will need to be a script or
> modification to rpt2pnp to issue the right commands for this setup.
>
> as a reminder the software for creating g-code to dispense solder paste from
> the .rpt file output of a KiCAD circuitboard project is here:
>
> https://github.com/hzeller/rpt2paste
>
> note that it's superseded by
>
> https://github.com/hzeller/rpt2pnp
>
> which may be newer.  the latter was confirmed to (apparently) correctly
> process
> the .rpt file from the project we'll likely dispense solder paste onto first:
>
> https://github.com/fitzdoingprojects/big_battery
>
> i'll be gone for two weeks but if anyone wants to make progress on this
> project
> please write back and i'll help as much as i can.
>
> -jake_______________________________________________
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