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Final assembly

A project log for Runout sensor for direct extruder

The internet has no good ideas

lion-mclionheadlion mclionhead 10/08/2022 at 20:560 Comments

The journey began with extracting another 5V from the ancient board.  DP2 & C50 were the winners this time.  DP2 was the pain in the ass diode which powered the board from USB.  24V is not an easy voltage to regulate down to 5V.

Then came the search for more loudness without adding an amplifier chip.  The winner was a 25 year old metronome, bought down in the back rooms of the HFAC after the lion kingdom left its previous metronome in the band room.  Somehow the combination of the large driver & resonant cavity made it extremely loud in the desired pitch range.  Today, you'd think nothing of such a simple buzzer or a phone app.

  This was actually a simplified metronome compared to one sold 5 years earlier for a lot less money.  Sadly, can't remember the features which were taken out.

The internet shows 2 cover designs with exactly the same functions.

The only way in was a headphone connector which no-one ever used.

Circuit diagram.  This was 1 of the PIC's with a bad MCLR pin.  It needed at least a 5k pullup instead of 10k.

Photo interrupter design.  It needs a smooth side facing the string, to prevent jams.

String routing has plenty of places for jams.  There are also plenty of ways for the wires to snare the gantry.

The LED was a fail.  You're going to see the empty filament roll before the LED.  It really needs a 100W lightbulb retooled for 24V.  The scotch tape menagerie could use a big 3D printed enclosure.

The lion kingdom would have to print like mad for this to be used just once before next year.  Lions just don't make enough after rent to make a lot of prints.  The mane idea now is testing the string behavior in its normal range of motion, over many prints.

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