some ikea lack and octoprint stuff

input/projects/3d-printing/ikea-lack.md

 
 My design files for the filament holder [can be found on my Gitea server](https://git.xythobuz.de/thomas/3d-print-designs/src/branch/master/ikea-lack).
 
+## Lights
+
+To be able to better see in-progress prints, I decided to mount some LED light strips to the bottom sides of the two upper tables.
+I am using 12V warm-white LED strips with 120 LEDs per meter.
+They are simply connected to the 12V power supply of the Fabrikator Mini.
+That was the easiest solution for now, although they flicker somewhat when the Fabrikator Mini is running.
+I have to think of another solution for that, probably a second power supply.
+
+<!--%
+lightgallery([
+    [ "img/lack_light_switches.png", "Design of my light switch mount" ],
+    [ "img/lack_lights_1.jpg", "Finished light switches" ],
+    [ "img/lack_lights_2.jpg", "Top level lights" ],
+    [ "img/lack_lights_3.jpg", "Bottom level lights" ]
+])
+%-->
+
+My design files for the light switch mount [can be found on my Gitea server](https://git.xythobuz.de/thomas/3d-print-designs/src/branch/master/ikea-lack).
+
 ## Concrete slab for noise and vibration dampening
 
 Unfortunately, because the Ikea Lack tables are very lightweight and also hollow, they tend to amplify the sound coming from the 3D printers on them.

input/projects/3d-printing/octoprint.md

 import time
 import RPi.GPIO as GPIO
 
-sleep_timeout = 1000
-sleep_toggle = 5.0
+hold_timeout = 2000
+sleep_toggle = 2000
 pin_button = 5
 pin_power = 3
 
 GPIO.setup(pin_power, GPIO.OUT, initial=GPIO.input(pin_power))
 
 while True:
-    channel = GPIO.wait_for_edge(pin_button, GPIO.FALLING, timeout=sleep_timeout)
+    channel = GPIO.wait_for_edge(pin_button, GPIO.FALLING)
     if channel is not None:
-        GPIO.output(pin_power, not GPIO.input(pin_power))
-        time.sleep(sleep_toggle)
+        time.sleep(hold_timeout / 1000.0)
+        if not GPIO.input(pin_button):
+            GPIO.output(pin_power, not GPIO.input(pin_power))
+            time.sleep(sleep_toggle / 1000.0)
 
 GPIO.cleanup()
 </pre>
 
 <pre class="sh_sh">
 sudo chmod a+x /etc/init.d/octopi-power-button
-sudo update-rc.d /etc/init.d/octopi-power-button defaults
+sudo update-rc.d octopi-power-button defaults
 sudo /etc/init.d/octopi-power-button
 </pre>
 
-Now every time you press the button (with a 5s debounce delay afterwards) the printer power will be toggled.
+Now simply hold your power button for two seconds and the printer power will be toggled.
 
 ### Automatic Photo Upload