Ender 3 Pro Bell Alarm Indicator

thingiverse

Absolutely in awe at the Dinglebopper, I couldn't help but upgrade it a little and try and improve it. Hardware needed: 1x tension spring 4.76x44.4mm long. 1x M6x50mm bolt. 3x M6 nuts. 1x M3x25mm bolt. 1x bell, 70mm diameter. 2x small zip ties for the bowden tube and cable support. I upgraded the spring holder to have built-in support for the hot end bowden tube and cables, and made it a little bit more visually pleasing. It simply clips onto the hot end. The main body also clips on in the same way as the spring holder. My bell was slightly bigger than the one used on the original so I widened the body slightly so it would still work. I made the pole attach by a M3 bolt, it made it simple to print and the bolt adds strength to the core of the pole. The design also features a cap to cover up the ugly slot where the main body slides on, and a second cap to hide the M6 nuts. Neither of these caps are important for the function of the bell, you can skip printing them if you want. For assembly: 1) Snip the 2 loops off each end of the spring, and push each end firmly into both the Ball and Spring holder. 2) To attach the pole, simply thread the M3 bolt through the hole in the body to secure it. The holes are undersized, so the bolt will cut the threads as you turn it into the parts. 3) To attach the bell, put the M6 bolt through it and put one nut on the other side, don't have it too tight so the bell doesn't ring, but tight enough so the bell doesn't have much movement along the bolt. Put a nut on the bolt, then thread it through the main body, then put the last nut on the rear side. When I was fine tuning the bell, I screwed the bell into/out of the main body; the curve of the bell allowed me to adjust exactly what point the ball hit the bell, and helped me adjust how loud the bell rung slightly. When its in the right position, tighten the nuts up. Once the bell is in position, open up Cura, go Preferences>Configure Cura>Printers>Machine Settings. Here you can modify the end G-Code to make the hot end move to the right and hit the bell when the print finishes. At the bottom right where it says 'End G-code' scroll through the text to find: G1 Y{machine_depth} ;Present print Change the line to say: G1 X{machine_width} Y{machine_depth} ;Present print and hit that bell At the same settings screen, you can see the Printers X width. You may have to change this to get the hot end to end its travel in the right location to hit the bell, but not crash into it. For my printer I had to make my x width 236mm wide to be perfect. Print with supports on for the main body (item 4) and the M6 nut cap (item 6) I didn't need a brim to print the pole (part 3) but you might need to if your printer is having some issues. Check the photo for print orientation. Be sure to support the horizontal x-axis gantry when pushing on the main body and spring holder, too much downward force and it can slide down, crashing your nozzle into the printer bed.