Search found 72 matches

by davidk
Thu Sep 14, 2017 3:26 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

Hi, I made it work, now I can print graphics with HP45. Here is a sample printed on glass and another on paper. However, the output is a bit faint, althoug all nozzles are firing. I tried with 2.0us primitive time @12.0V, I'm afraid to go further. Should I fire the same pattern more than once for de...
by davidk
Fri Sep 08, 2017 8:06 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 299
Views: 171676

Re: Hacking the Xaar 128 printhead

I was also glad because I read piezo heads can handle almost any fluid -which is not the case with this xaar. I had a head that I destroyed after a short test with water. I read the documentation again and they say it runs on aqueous inks. By the way, there's no direct reference about supported inks...
by davidk
Wed Aug 30, 2017 8:21 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 299
Views: 171676

Re: Hacking the Xaar 128 printhead

Where can I find a proper capping for this head? And not too expensive...
by davidk
Mon Aug 21, 2017 5:40 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

What's the maximum fire rate you can achieve?
by davidk
Sat Aug 19, 2017 5:12 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

Hi, Please look back in my previous posts for the schematic and my observations. Another thing, I bought an old HP printer and I took the printhead connector and the rubber capping system to seal the printhead. The microcontroller is slow, because I loose so many time rearranging bits for firing cyc...
by davidk
Fri Aug 11, 2017 3:10 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

Hi, I finally managed to fire this cartridge with my L6452 driver that I wrote above. The missing horizontal lines aren't clogged nozzles but a short on address 21/22 that I'll repair later. If I will redesign the PCB, I will rearrange primitive outputs. Since odd and even ones are on different rows...
by davidk
Thu Jul 06, 2017 4:34 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

Of course. This is a 50-50% hobby-professional project and I don't have much time, otherwise it would have been finished. But I can share it here so I'll let you know about my conclusions.
by davidk
Thu Jul 06, 2017 11:15 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

Hi math,

I posted a few posts ago the schematic. The only mistake is the 19V output of LT1930 should go to VStepUp and Vr to 12V. If you read the schematic you'll understand. I made a simple firmware to test the pins output, no real test with a cartridge yet.
by davidk
Fri Jun 30, 2017 4:38 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

Hi,

I started testing my design using ST L6452 with the schematic I show few post ago. Good news, the LT1930 outputs 19V for Vboost and all voltages are correct. The air is clear, no smoke released :-) . So I can start coding the ATMEGA64.
by davidk
Tue May 30, 2017 8:33 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 596
Views: 380452

Re: Hacking the HP45

Thank you, David, for your posts here. You determined us to research into using this ST chip and I appreciate this. Your advices are very appreciated.