3D Tips and Tricks
under construction more to come..
This section is really going to be more of a F.A.Q of problems and issues I faced with suggestions to steer you towards a hopefully helpful solution.
Octoprint UPS upgrade these instructions were found Here
I used a APC BackUPS Pro 550, which seems to be about the minimum spec I can get away with, on my printer this gives me approximately 5 minutes of print time without power, or 40 minutes of the printer powered but idle, other UPS's would work but APC is the only type tested with these instructions
Now we need to tweak apcupsd's configuration a bit. Edit the apcupsd configuration as follows, you can find it at /etc/apcupsd/apcupsd.conf, just use your favourite editor. Find and change the following lines.
You might need to tweak BATTERYLEVEL and MINUTES for your printer and UPS. this is the percentage of power left before the shutdown will trigger or the minutes of runtime, whichever one happens first
Now start the service, it will start by itself on the next boot
If all is well typing apcaccess status at the prompt should get you some stats from the UPS, battery level etc If that's all good then apcupsd is configured, now for the script that aborts your print First go into the octoprint settings from the web interface, make sure API access is turned on and record the API key carefully Back on the rpi go to the home directory
Now download this custom shutdown script with wget (if so for some reason link below is dead contents of the script are Here)
Don't be tempted to rename the file, leave it as this name Now edit the script and change the variable at the top API_KEY to the API key you got from your copy of octoprint earlier That should be it, the script does 3 things when the power fails and the battery goes below one of the trigger points. it Prints a warning on the printer's LCD screen Records the current printer status and print file position to a file in /home/pi, so that maybe you can work out how to slice the reminder of the model and save the print then it Aborts the print.
See the section of Simplify3D Problem
Changing the color of filament mid-way through a print
G91 ; set relative positioning
When your print arrives at the gcode you inserted it will pause the print, lower the bed 40mm and lock the stepper motors until you resume the print. During this pause the Hot-end and Heated bed will stay on, you need to swap the filament and use the controls on your printer to advance the new filament far enough that your old color is completely gone. Now resume the print taking care to pull any residual filament from the extruder/hot-end. Assuming eveything went correctly it should resume exactly where it paused and start printing the new color of filament.
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