Form 1+ interacting through python

nick8 · March 20, 2018, 12:03pm

i installed dependencies (pip install -r requirements.txt ) through cmd and i want to use this code:

Formlabs/OpenFL/blob/master/examples/insert_material_swaps.py

#!/usr/bin/env python

import sys
import os
sys.path.append(os.path.abspath('../OpenFL'))

from OpenFL import FLP

def insert_pause_before(layer,
                        zJog_mm=100,
                        buttonPressMessage="Press to continue."):
    """
    Jog up and wait on button press then resume.
    This is done when the tilt motor is at its lowest.
    """
    import numpy as np
    tiltMoves = [x for x in layer if  isinstance(x, FLP.TiltMove)]
    bestAfter = np.argmax(np.cumsum([move.usteps for move in tiltMoves]))
    lowestTiltMove_i = layer.index(tiltMoves[bestAfter])
    insertBefore_i = None

This file has been truncated. show original

but i cant even communicate with the printer. When i hit :

from OpenFL import Printer, FLP
p=Printer.Printer()
I get this error : No backend device available .

Any suggestions?

Stuart_Wood · March 20, 2018, 4:45pm

Hi,
I played around with this a lot to try to make PCBs, gave up because of the light scatter gave very poor tracks.
In doing so, I encounter all sorts of problems, including this one.
Try unplugging the USB, wait a few seconds and reconnect. The “backend device” is the USB interface.
I hope you are doing this in Linux, I didn’t even try under Windows since libusb will cause problems there.

Any error, crash or other unexpected result, re-plug the USB, it never cleanly sorts itself out otherwise. I wasted a lot of time before I realised this!
-Stuart

nick8 · March 21, 2018, 7:40pm

I am using windows and now i tried to use a virtual machine with ubuntu 17.10 . I installed dependencies (pip install -r requirements.txt ) and then i used these codes through python :

from OpenFL import Printer, FLP
p=Printer.Printer()

and i get this error:

What is wrong?

MattKeeter · March 21, 2018, 9:46pm

Try searching for the error message!

Briefly, you’ll need to set up a udev rule. The Google search should point you to more information.

nick8 · March 22, 2018, 9:22pm

well i used sudo commands prior to opening python and its ok now. I am connected to the printer but i cant read FLP files from it. The only command that works on the printer is : p.initialize() that reset the printer

When i try to run this python script

github.com

Formlabs/OpenFL/blob/master/examples/print.py

#!/usr/bin/env python
"""
This is a Python script that prints an FLP
"""

import OpenFL.Printer as P

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="Print a .flp")
    parser.add_argument('input', metavar='input', type=str,
                        help='source flp file')
    args = parser.parse_args()

    p = P.Printer()
    p.initialize()
    p.write_block(0, args.input)
    p.start_printing(0)

I get this error:

nick8 · March 27, 2018, 10:33pm

I realised that i am able to call every function that is located in the Printer.py ( like p.initialize() ) but i cant call functions from the FLP.py . I tried to use p.read_block_flp() and i got this error :

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Form 1+ interacting through python

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