Search found 71 matches

by davidk
Wed Feb 27, 2019 7:28 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

Hi Dragonator, The speed can be much higher. However if I print fast and with much ink (all nozzles at once) the head starves. I suppose it's because my heads are scrapped and probably the internal filter are clogged. So, as I can't feed ink properly I'll print slow. And if I run slow there's no ris...
by davidk
Tue Feb 26, 2019 2:18 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

Hi, This is my project. For now I don't have the Y axis, so I can print only one pass. I use Triangle INX "MLD Magenta" ink. The capping is milled for this project and as sealant I use gasket RTV as in pictures. It seems it doesn't dissolve in ink or solvent. The ink tube is also silicone. For now, ...
by davidk
Mon Feb 25, 2019 6:37 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

I'm still testing my setup and I'll come back with conclusions and photos in a few days! I'm almost done.
by davidk
Sat Jan 26, 2019 7:09 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

Solvents for inks usually can't evaporate quickly. If you want to use acetones or cloroform, these could dry too fast leaving nozzles full of more viscous liquid or even clog. I tested some heads with isopropyl but I couldn't use it as solvent because it dries too fast. Solvent for original ink look...
by davidk
Fri Jun 22, 2018 2:30 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

For some stubborn clogged heads I pushed 2.5 bars and nothing bad happened., they are still working. You just can't unclog a 50u nozzle with 0.1bar! I'm not saying that you MUST put that much pressure, maybe I was lucky, but still, I think 1...1.5bar is a reasonable pressure for this head. On the ot...
by davidk
Sat Jun 16, 2018 5:19 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

If ink accumulate on the bottom plate, check the vacuum. Ink level should be about few cm below the bottom plate.
by davidk
Sun May 20, 2018 5:33 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

Or you could place the ink reservoir so the ink level would be 1 inch lower than the nozzle plane. This is a good vacuum any xaar128 should work.
by davidk
Fri May 11, 2018 6:54 pm
Forum: 3DP printing
Topic: Info for Epson Precision core printhead
Replies: 10
Views: 9160

Re: Info for Epson Precision core printhead

Here are the pages for the head driving. I can't attach here the whole pdf, it is a 16MB file.
by davidk
Tue May 01, 2018 5:45 am
Forum: 3DP printing
Topic: Info for Epson Precision core printhead
Replies: 10
Views: 9160

Re: Info for Epson Precision core printhead

It makes sense, but it would take much time to extract the data like the guy in my link. The DX heads are very strong and are made for a wide range of fluids. They are expensive indeed but you can find used heads and/or with clogged nozzles very cheap or for free. Eventually you can buy new ones aft...
by davidk
Mon Apr 30, 2018 8:22 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 130978

Re: Hacking the Xaar 128 printhead

Vpph and vppl can be switched by the same relay. After that relay, you may filter again the 35V for VPPL. On my chineese head flat cable adapter all grounds are tied together. So I have the same ground everywhere and my heads are working properly with isopropanol, which by the way is very well toler...