Filamentalist 3MS MMU extension
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A base unit to lift your filamentalist roller up and upgrade it into an MMU
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This is a very simple socket that mounts below a Filamentalist Roller/Rewinder/Buffer (https://github.com/Enraged-Rabbit-Community/ERCF_v2/tree/master/Recommended_Options/Filamentalist_Rewinder) and turns it into a very simple extruder unit to be used in an MMU.
The idea here is to add a stepper motor below, and some sort of reasonable slim extruder above.
The nema17 mount is offset a bit to one side. Depending on your extruder, you might have to flip the plate upside down , or modify the source file to fit your extruder. The best fit is with lerdge extruders, which i use. I have also tested simple single/dual drive metal extruders, bmg geared extruders, but their tensioner arms collide with the Filamentalists side panels. You might be able to get around this by moving the extruders mount location around a bit. I have added the original f3d for anyone to customize.
Print your Filamentalist with the tensioner mount in the rear load configuration. You can either use the sensored version of the tensioner mount if you are using a sensorless extruder, or use the non-sensor version and an extruder like the lerdge that has a built-in sensor.
Print one of each leg and one baseplate. The baseplate replaces the original Filamentalist baseplate. Finally, you add the original baseplate below everything.
Depending on the depth of your steppers you might also want to stretch or shorten the legs, you can probably get away with just doing this in your slicer.
You only need a couple of centimeters of bowden tube between the Filamentalist tensioner mount and the extruder. If you use an extruder without a bowden coupler on the inlet, i have added a small bowden tube holder. Just drill a 4mm hole and sink a heatset insert in the right location, then add an m3 bolt with the right amount of washers below to make the bowden tube line up with the extruder.
To set it up as an MMU, i recommend reading up on the 3MS (https://3dcoded.github.io/3MS/), which this build is based on. The idea is to have a very simple MMU by just giving each lane its dedicated stepper/extruder, running in sync with your main extruder.