[sudo-discuss] 3d printer solder paste dispensing at sudoroom using rpt2paste

[hol at gaskill.com]

interested in making some smd Sudouinos once it's up and running. zero
bandwidth for software development rn on top of limited coding skills
myself.
On 2018-12-19 2:07 pm, Morgan Allen wrote:

> I just kept it to myself, stencils are better. 
> Also, did you sacrifice the 3d printer to accomplish this? 
> 
> On Tue, Dec 18, 2018 at 6:47 PM Jake <jake at spaz.org> wrote: 
> 
>> 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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