Minimalistic Mk8 replacement
by emmett, published
I get much better prints with these than the stock Mk8s because they grip much better on a variety of filaments due to the compliance and there is much less friction thanks to the bearing. I was using Protoparadigm's PLA and having all kinds of problems with missing filament after reversals, but not anymore. No more lost steps or stripping on the extruders, and an added bonus is you can now clean the drive gear without disassembling the unit. Also, switching colors is quicker since you can just squeeze and pull instead of going through all that unload/reload filament business.
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I'm very interested in your rep2 mod! I'd like to use it in mine if you don't mind of course =)
I could only get the "#9657K331 Steel Compression Springs" in packs of a dozen, so if anyone wants a couple of them i'd be willing to sell em' off.
p.s. AMAZING mod, makes the replicator 1000 times better (especially when I need to change out the filament in a hurry.)
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Disassemble the fan/heatsink and remove the old extruder. Use the same mounting bolts to attach the two pieces of the minimal Mk8 extruder. Make it nice and tight and reassemble the fan and heatsink the same way. Cram a spring into the notches between the two arms. I used the same spring I used on the original minimal Mk7, which in my case was Utility Comp Spring C-614 (5/16 x 1-1/4 x 0.041 inches) I found at my local hardware store.
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