Search found 92 matches

by Wonko
Mon Mar 05, 2018 8:52 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 132011

Re: Hacking the Xaar 128 printhead

I use mosfets. I believe that the reason behind separating the ground lines is keeping the 35V sources as independent as possible. One 35V line is used to supply the power to the piezzos and needs power, but less stability. The other one is used as a reference voltage and should be very precise to k...
by Wonko
Mon Feb 26, 2018 10:50 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 132011

Re: Hacking the Xaar 128 printhead

It says on page 25 that the maximum frequency for SCK is 2MHz. I use bit banging, so I am well below that. This is the code I used to get close to 1MHz on CLK from my Arduino Uno: const int XaarCLK = 3; // Pin 15: <- 1MHz clock // Generate 1MHz for the ink cartridge in hardware // also: https://gith...
by Wonko
Mon Feb 26, 2018 11:11 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 132011

Re: Hacking the Xaar 128 printhead

It should be 1MHz (or slightly less, if you use a timer on the CPU and don;t have a matching divider)
by Wonko
Tue Feb 20, 2018 9:42 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 132011

Re: Hacking the Xaar 128 printhead

The Epson printhead has a completely different interface than the Xaar head. I did not find specifications, but in general, the Xaar head has three supply voltages and a simple SPI interface. The Epson head, AFAIK, requires a quite complex power supply that uses a voltage pattern. The digital contro...
by Wonko
Fri Jan 19, 2018 9:30 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 132011

Re: Hacking the Xaar 128 printhead

Well, it seems like you are half way there. Getting any ink out is already a great achievement! If all nozzle fire, either your data transfer is messed up, or your ink head is broken. The pin that shifts data into the head, that decides which nozzles will fire, is MOSI. Ideally, look at MOSI and SPI...
by Wonko
Mon Dec 25, 2017 11:11 pm
Forum: 3DP printing
Topic: Hacking Canon PG40
Replies: 9
Views: 7634

Re: Hacking Canon PG40

Thanks! This was a really great read! I am really looking forward to your next findings ;-)
by Wonko
Sun Nov 26, 2017 10:12 pm
Forum: 3DP printing
Topic: spectra nova 256 print head
Replies: 4
Views: 3992

Re: spectra nova 256 print head

beytullah wrote:The Xaar 128 print head is quickly failing
Yes, the Xaar 128 requires compatible ink. Good luck with the Nova head. I am looking forward to hearing about your progress. Fingers crossed!
by Wonko
Sun Nov 26, 2017 1:08 pm
Forum: 3DP printing
Topic: spectra nova 256 print head
Replies: 4
Views: 3992

Re: spectra nova 256 print head

With a 1600 Euro head for a single color? And I thought that the 150 Euro Xaar 128 printhead is beyond consumer reach... .
by Wonko
Fri Sep 08, 2017 7:54 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 132011

Re: Hacking the Xaar 128 printhead

Thanks, Simonsigns. It took me month originally to find the documentation on the Xaar 128. Eventually I stumbled over the original docs during a visit to China. By now, with some Google skills, the Xaar XJ128 Guide to Operation is quite easy to find. I know the board that you are talking about. Yes,...
by Wonko
Wed Aug 30, 2017 8:19 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 132011

Re: Hacking the Xaar 128 printhead

The purging procedure helps if the ink is clogged. If you have air trapped anywhere, the head can not build up enough pressure to eject the air. The manual explains how to fill the head the first time, and how to get the air out IIRC. The Xaar 128 is pretty tough compared to the Epson heads that, fr...