MMU-owners: tip forming or cutting?
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Hi gents,
I'm working on my own toolchanger and have to retract filament out off the hotend.
I reckon, I will encounter the same problems as MMU owners regarding deformed filament tip.
There are two options I've heard off. tip forming and cutting
Which is easier/better in your experience?My own idea would be a hot wire or hot blade next to the tool parking station. I hope it will reduce forces required to cut the filament.
Another option would be: not to retract filament but have a hotend on each of the tools, but that would start a daisy chain of expensive hardware (hotend, heater, thermistor, fan, maybe a toolboard for every tool)
Any insight is welcome
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@o_lampe tip forming pretty unreliable in my experience, even if it saves a bit of waste. Cutting pretty reliable and easy with a blade - i've done 10's of 1000s of colour changes on my Bambulab printers and so far have never needed to change the blade.
Long retractions also an issue with the MMU2/3. The Bambulab approach of rewinding spools much more reliable - although slow and complex, or the shorter multiple PTFE approach of AMS lite quicker for a limited number of colours.
Separate nozzle (if necessary hot end and extruder) much more preferable than any multiplexing approach both in terms of waste and speed.
