Search found 14 matches

by notsure
Mon Aug 10, 2020 11:09 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 622
Views: 437088

Re: Hacking the HP45

For using aqueous look at the older Epson piezo heads.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC507883/
This paper has all the drive specs.
by notsure
Mon Aug 03, 2020 1:46 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 622
Views: 437088

Re: Hacking the HP45

We used to put solvent through the HP45's and the Lexmark TIJ. Mostly ethanol/methanol. What are trying to do with acetone and powdered plastics? Solvent weld plastic powders? Acetone has a pretty high vapor pressure so it will dry in the heads if left uncapped. I can supply you with UV curable bind...
by notsure
Tue Jul 28, 2020 7:10 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 322
Views: 206048

Re: Hacking the Xaar 128 printhead

You will not only need pinouts but all the timing diagrams. They far more complex than the xaar 128 heads. But you can program the firing wave forms.
by notsure
Thu Jul 23, 2020 4:01 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 622
Views: 437088

Re: Hacking the HP45

@nicolasgr

The Xaar 128's can print a binder for sand or other powders. It just can't be aqueous since it is a shared wall design the fluids can not be conductive.
by notsure
Sat Jul 18, 2020 8:19 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 322
Views: 206048

Re: Hacking the Xaar 128 printhead

@yeswanthnag

Do you have apart number? Why the KM heads? I'd look at Ricoh for reliability.
by notsure
Sat Jul 18, 2020 8:03 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 622
Views: 437088

Re: Hacking the HP45

@nicolasgr

The HP45 cartridges are only good for about 1-2L of fluid before they start dropping nozzles. You won't be able to print a very large sand mold or core using them unless you have lots of them.
by notsure
Thu Jul 02, 2020 3:29 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 322
Views: 206048

Re: Hacking the Xaar 128 printhead

@ BlueTurtle
You want the ink at a slight negative pressure entering the heads. -100 to -800 Pascal.
by notsure
Wed Jun 10, 2020 7:10 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 322
Views: 206048

Re: Hacking the Xaar 128 printhead

For most piezo heads keep the viscosity around 10 cPs at the jetting temp for the fluids and inks. It varies a bit from model to model but it's a good ballpark to be in. Watch the drops and then tweak based on results. Any particles should be <1um as good rule. Most heads have some sort of filter in...
by notsure
Fri Jun 05, 2020 2:06 pm
Forum: 3DP printing
Topic: Material system
Replies: 1
Views: 734

Re: Material system

Look at what materials HP is using for their Jet Fusion printers. They also use printheads with lots more nozzles than the 128 and multiple printheads. Run the numbers on the 128. For a single head with a 9mm print swath at ~8kHz it travels at about 0.6m/sec. Is this fast enough for your application?
by notsure
Thu Jun 04, 2020 3:08 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 322
Views: 206048

Re: Hacking the Xaar 128 printhead

People here have tried UV inks with these heads and they don't work since the viscosity is too high near room temp. The off-the-shelf UV inks expect the heads to be heated to lower the viscosity of the ink, mine work at room temp.