Search found 71 matches

by davidk
Thu Apr 26, 2018 6:28 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

It looks like either you have a faulty SPI pin , it's shorted or you did not configured it as output from Arduino.
by davidk
Thu Apr 26, 2018 12:59 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

Phat is the device generating TTL signals? What voltage, I mean (5V or 3V3)?
Is the SPI data stable on the rising edge of SCK?
by davidk
Thu Apr 26, 2018 10:03 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

This is beyond the mesh filter. I suppose the white thing is oxidation from water. This was an used printhead that I used with water. It has cyan ink so I suppose the white stuff must be oxids.
by davidk
Wed Apr 25, 2018 12:01 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

As I said, I got myself a lot of used printheads. I am really annoyed by the very strong smell of the "true" solvent they use so I tried to find an alternative ink, as mild or eco-solvent. So, do you think there's a different kind of ink that may be used for testing? I got prints, all is OK but I ha...
by davidk
Fri Apr 20, 2018 7:34 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

Check with a scope that you correctly select nSS1 and nSS2 before sending corresponding SPI data. Also check SPI lines and CLK. Be aware also that if you have 3.3 CPU you will need a buffer since this head has 5V lines and won't read correctly high speed 3.3V signals (CLK, SCK and MOSI). I had a ver...
by davidk
Mon Apr 16, 2018 3:53 pm
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

Does the head type -wetting or non wetting matter in ink selection? Why are there two types anyway?
by davidk
Sat Apr 14, 2018 8:20 pm
Forum: 3DP printing
Topic: Info for Epson Precision core printhead
Replies: 10
Views: 9196

Re: Info for Epson Precision core printhead

Hi, Here I found complete schematic of a Roland printer, including head control board: https://www.scribd.com/doc/142024676/Roland-Printer-Service-Manual-XJ-740 Unfortunately an account is needed but I got it. So this is the source of DX4 pinouts from my schematic. Here http://techref.massmind.org/t...
by davidk
Sat Apr 14, 2018 6:29 am
Forum: 3DP printing
Topic: Info for Epson Precision core printhead
Replies: 10
Views: 9196

Re: Info for Epson Precision core printhead

I just meet a friend of mine that has a large format printer and he gave me an Epson DX4 head and promised mea bag full of partial clogged ones. It sems that anyone having a solvent printer can easily collect a ton of used heads that are just verygood for testing our projects The good thing is these...
by davidk
Wed Apr 11, 2018 5:37 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

I wonder if, whwn using a solvent ink, I can leave the printhead nozzleplate soaked into solvent when not used for several days or weks. If it's designed to work with solvent it shouldn't be an issue. This is to avoid purging too often and drying and clogging.when unused.
by davidk
Mon Apr 09, 2018 6:14 am
Forum: 3DP printing
Topic: Hacking the Xaar 128 printhead
Replies: 287
Views: 131395

Re: Hacking the Xaar 128 printhead

I wonder what's the minimum setup to drive a single head from the computer. No other sensors, valves or motors.