Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

maybe try to make the inkjet just like the hp7475a plotter?
i'm sure the motor has plenty of power (think of friction with paper).

the hp type printers can be easily converted by putting a big pcb on top of
the big transport roller.
maybe make a guiderail in the middle to keep it parallel to ground and
running straight.
maybe make some counterpressure rollers on top on the sides (small
bearings, rubber rollers).
but be aware that in most cases the print head runs over that area so use
flat rollers.

then there is somewhere a optical sensor for paper empty/loaded.
this can be easily used by putting it on the side in the way of the pcb.

when the printer starts plotting it powers the motor until the paper
reaches this sensor.
simply move it on the roller with your hand then and let it be moved to the
sensor.
there it stops and the printing begins.


i would not go for circular disign.
the conversion (the software) would be much more effort for me than getting
a printer modified.


you can get inkjet a3 aize if you really need... but a4 would be perfect
for pcb.


i have modified a 550c like described above.
it moved the big pcb desk fine, but i killed the electronics accidently.

later i found out floor polish is no good in thermal bubblejet (hp type).


it would be very nice to hear from any success with that method.

this resist is uv cured?
how long would it take to cure in a eprom eraser 8w tube source?


most interested i am in print heads, which models use piezo, which models
use head an cartridge and which fixed head in printer.

i'm not interested in buying any expensive industrial type head.

which resolution do you think is needed?


regards
stefan