Search found 452 matches

by dragonator
Thu Apr 09, 2020 6:27 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 562
Views: 355473

Re: Hacking the HP45

The pulldown resistors on the address side are not really optional when using TLC59213. Without pull down and address takes well over 1ms to go to low. In your current setup there is a good chance that multiple or even all addresses are open when you print. This prevent the nozzles from firing prope...
by dragonator
Sat Apr 04, 2020 5:43 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 562
Views: 355473

Re: Hacking the HP45

a nozzle can only be on for around 2us. If it is physically on for 12us, it might burn out. You must wait 80-100us to fire again. The ink needs time to flow back into the nozzle. All addresses need to be connected to ground. They are the inputs of mosfets, floating mosfet gates can stay half open, c...
by dragonator
Fri Apr 03, 2020 4:50 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 562
Views: 355473

Re: Hacking the HP45

Hello, I mailed the manual to you. You can manually trigger each nozzle with discrete components but there are a few things you need to do. The printhead is common ground, and the ground needs to be connected all the time. Unconnected ground may cause issues with the addresses. The primitive is high...
by dragonator
Mon Mar 16, 2020 5:38 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 562
Views: 355473

Re: Hacking the HP45

The GTP:-C suggests the printhead is not connected properly. Either the pins do not align with the printhead properly (you can see if you take the controller of the printed part where the printhead pads sit in relation to the pins) or the big mosfet in the middle of the driver is not properly connec...
by dragonator
Sun Mar 15, 2020 9:10 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 562
Views: 355473

Re: Hacking the HP45

Hello, I assume you are currently using the V3.02 for both boards. The only real difference for you is that 1 resistor is connected differently. Other than that there are no real differences. The GTP:-C means that the printhead is not found. Either you don't have power to the printhead, or it is not...
by dragonator
Tue Feb 25, 2020 6:48 am
Forum: 3DP printing
Topic: New project powder 3D printer ZEUS
Replies: 41
Views: 4457

Re: New project powder 3D printer ZEUS

It depends a bit. Do you need a linear encoder or a rotary encoder. My optical linear encoders have yet to give me much trouble. I know these are also in my Zcorp printer. If you insist on having a fully closed encoder, search for "incremental rotary encoder" and you will get plenty of closed rotary...
by dragonator
Sun Feb 02, 2020 5:18 pm
Forum: 3DP printing
Topic: New project powder 3D printer ZEUS
Replies: 41
Views: 4457

Re: New project powder 3D printer ZEUS

Plaster does compress. I do not have hard values, but it is more than 10%, maybe even more than 25%. In double piston machines this is mitigated by compressing the powder in both pistons. One thing that does worry me a bit is if the powder will actually fall from the bottom of the funnel. My experie...
by dragonator
Fri Jan 24, 2020 1:59 pm
Forum: 3DP printing
Topic: New project powder 3D printer ZEUS
Replies: 41
Views: 4457

Re: New project powder 3D printer ZEUS

Still here, just working on some things that do not really warrant posting.

The forum does this every now and then. Some good discussions going on for weeks or months, and then mostly silence for another few months.

That is a great looking design. What are your current print dimensions?
by dragonator
Tue Dec 24, 2019 4:49 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 51147

Re: Hacking cartridge HP 84/85

I made a connector that holds pogo pins. I will also make an ink supply and a suction cup, and then I can test whether I can send lines to it.
IMG_20191224_174655.jpg
IMG_20191224_174655.jpg (474.59 KiB) Viewed 1012 times
by dragonator
Tue Dec 17, 2019 5:34 pm
Forum: 3DP printing
Topic: Hacking cartridge HP 84/85
Replies: 162
Views: 51147

Re: Hacking cartridge HP 84/85

I do finally have the time, and now that you have shared this, I finally bought an HP84 myself. I do hope I can find a few days around Christmas to mess with this. First thing I will make is a connector so I can wire this up.
IMG_20191217_183105.jpg
IMG_20191217_183105.jpg (355.54 KiB) Viewed 1182 times