MR52ZZ Filament Runout Sensor
Description
I really liked the simplicity of Akegata's filament runout sensor. Unfortunately, over time the piece that sits between the filament and the switch wears down leading to annoying false triggers. Bodroi's sensor avoids this problem by using bearings for the filament contact which appears to work well. The problem with that design is the 608 bearings are pretty heavy for mounting on a direct drive extruder. This design attempts to combine the lightness of Akegata's with the functionality of Bodroi's. To reduce the weight I replaced the common 608 bearings with MR52ZZ bearings. The ones I found are not particularly high quality bearings but should be adequate for the speed the filament moves through them. Overall this runout sensor weighs ~5g. For reference Akegata's weighs about 3g. A single 608 bearing weighs about 10-11g. This design requires the following additional hardware: * 2x MR52ZZ 2x5x2.5mm bearings (https://www.amazon.com/gp/product/B07MLZWJ4D). * 1x 2x4mm screw * 1x 2x8mm screw * 2x 2x10mm screws * 1x 12.6× 6.5× 5.7mm microswitch (https://www.amazon.com/gp/product/B073TYWX86) * 2x short PTFE tubes * 1x 5 pin female JST connector (optional), the outer holes line up well with the microswitch pins needed for connecting to the printer. Note that all screws can be longer than the listed size if needed.
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