Sprite extruder filament cutter proof of concept!!!

[@DrGeta666]

I'm wondering what the use of the cutter is above the extruder? it makes sense having it below the extruder like in the voron because it uses the second filament to push the first one through which because it's snug inside the thin channel between the extruder and heatsink it goes through without issue, if it's above the extruder the first filament will stop just after the gears as thats the last thing it can touch, then the second filament is being fed into the extruder where there is massive holes and gaps for the filaments to miss each other or more likely hit the first one and angle it into a gap and cause a clog. you would be better off having the whole filament removed by the rabbit with the stretched out bad tip, extract it back to the rabbit and cut it off there for a clean filament end.

[@DrGeta666]

But yeah i'm happy to test it out if you like. looks good for the task it was designed to do for sure, just wondering what the advantage or purpose of it is in the ERCR system. throw the STL up somewhere and i'll give it a crack :)

[@TheTechnologicalNerd]

Hey, its looking great! Could you share that CAD models?

[@DrawModelPrint]

I'll be releasing it by this weekend and adding in variations over the next week.

[@TheTechnologicalNerd]

Awesome, thanks

[@jamy6431]

It's cool but I'd angle the blade if possible, you are supposed to cut the filament at a 45° angle

[@DrawModelPrint]

I was thinking this also, but after going over the voron filament cutter and the one for Bambu printers, both of these companies use a chisel type blade at a 90. I could possibly be wrong, but that's what their schematics show. Also, I used to go by this rule myself, but after some time with my printer, I noticed it doesn't care as long as it's a clean end. If this does cause problems, I will redesign, but I'm trying to avoid this as it will add more weight and make to the overall design more bulkier.

[@Milkex]

90deg here, you don't want the gears only catching part of the tip and slipping when reloading

[@DrawModelPrint]

@@Milkex Wasn't even thinking about that. That is a good point, my entire thought process was if the top brands in the printing industry are doing it this way why reinvent the wheel. Both of these brands have probably put a lot more testing into the idea than I ever will.

[@DrGeta666]

@@DrawModelPrint yeah 90' is good for hand feeding into things just so it does not get caught on things but you want the two filaments being pushed together to be flat to make it as straight and smooth as possible.

[@DrawModelPrint]

@@DrGeta666 The reason I dont see this as a problem is because the extruder will be extruded and then the gears will be released when the filament is being fed at the same then extruded to prime the nozzle. I've cut filament every which way to see if it would cause problems for the sprite but it never has as long as you can get the filament in the teeth of the extruder that thing will push it through. I did some hand testing with bowden tubes to simulate filament feeding from the ERCF with a macro I have setup and it feeds fine. Now if I run into problems with the ERCF thats another issue that will be handle when I get to it. No point in climbing a hill when its not right in front of you yet.