@SteveYYC adding ;e to the g1-line has answered my question #1. thanks again.

@Danal i do not have a z-endstop mounted near the nozzle - i don't hav a z-endstop at all.

dc42's hint solved my issue.

@SteveYYC

1. inserted m80 into config.g and i did not (yet) observe the absence of the atx control box. having an eye on it.

2. i had 'G1 X0 Y0 Z75 f1000' at the end of my print file. added ';e' and now the correct total number of layers is displayed.

thanks for your help.

@CaLviNx i could operate the rpi using 5v-power from the duet but i would loose the ability to switch off duet's psu when the print has finished.

if you still cant work it out I would be willing to purchase the secondhand board from you

seems you are looking for a cheap board.

are obviously unable to operate it properly.

ok, it seems, i am unable to operate it correctly after i was able to do so for 4 monthts. wondering what the change could be.

i understand: i'm on my own!

@Veti when i last had removed the belts everything moved without resistance but i'll check when a find enough time and energy after my bread and butte job.

@mrehorstdmd no, it's got fiberglass belts as.

we can see the head moving in x and y direction where it should not move in these directions.

thanks for your answer.

we checked and did not find any issue.

the strange thing is that that 2 lines (left and bottom) are fairly straight while the other 2 lines (right and top) are crooked. because it's a core xy printer this makes us think that the issue might be related to the direction of rotation of the steppers.

have you got any further hints?

@Veti it's a self made printer (blv mgn). what do you suggest to check/fix?

sorry for this new request for help ..

we just have experienced that straight lines are (no longer) straight but kind of crooked in x- and in y-direction.

see attached image.

we tested using cura 4.7.1 and slic3r 1.3.0

is there a known solution for this issue?

tia for any assistance.

@bearer going to to it this way and hoping the next rpi will survive for longer than 4 months - otherwise i think it would be best to go without an rpi - lost functionality but no rpi.

sorry for any inconvenience ..

@bearer i was told )by a person who knows how to operate the duet device) to do it this way. just wanted to point out that i lose functionality when following his advice.

rgds.

@spllg if i power the rpi form the duet i will loose the ability to switch the duet psu on using the web interface. any suggestions?

@dc42 clarification: i did not power the duet via the usb (i did with my forelast one). instead i powered the rpi using an original rpi psu and powered the duet via the ribbon cable (5v->sbc and sbc->5v both closed as instructed by dc42). i did this in order to be able to switch the 24v psu on and off using the web interface.

as i am not an electronic engineer, i considered to 5v-power the duet and the rpi using 2 distinct psus (with 5v->sbc and sbc->5v both open) but now i feel, the only safe way to use the duet with a rpi (3+ not 4) is to power the rpi3+ from the duet (with 5v->sbc closed and sbc->5v open).

i will power the rpi from the duet, ground the stepper cases and see how long my next rpi will stay alive.