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Figured out why printer jams so much

There is a flaw in the design, the white tube inside the head is a very tight fit

Is it possible to bore the hole out slightly larger?

When the plastic jams in there, the filament drive cannot advance the plastic. And that is where the filament keeps jammming, on two separate head assemblies!

Answered! View the answer I have this problem too

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Yes boring the teflon tube out slightly worked. It is now feeding filament that would not pass through the block before!

Go BoXZY go!

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Printing with the bored out head is 100% different, forst the filament loads without any real problems. It just works.

Secondly, I printed a few things and no clogs or jams. This is almost turn key.

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That's great to hear! What diameter bit did you use?

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2.5mm but I think I could have gone larger, it worked tho.

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If you're referring to the white plastic that is set into the black plastic, then the answer is definitely. When the aluminum is overtightened into the black plastic piece it can crush that white plastic part and reduce its internal diameter. You can drill it out and increase the diameter safely. Just make sure no debris stays in the filament path or it will eventually block the nozzle. So drill away and clean well.

During reassembly make sure the metal hose connector on the back end of the nozzle is only installed enough so that the rubber o-ring just started touching the the black plastic. Then make sure the gap between the black plastic part and the aluminum heater block are the same as they were originally. The idea is you don't want to screw the two parts together hard enough to crush the white part, everything just needs to be touching internally. Replace the teflon tape over the threads on the aluminum heater block as well to seal those threads from plastic leakage.

As a note, some filament is not actually 1.75mm which can cause it to be tight inside the entire tube. Hatchbox filament has guaranteed tolerances that should always fit well. All filaments should be measured with calipers in various lengths and places to make sure the filament is not oversized or inconsistently sized.

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That is how I figured it out. I measured em with calipers then opened it and saw where the feed was stopping.

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OK, I bored the tube out this morning, I will be putting the head back together after work today and test printing. I will let folks know how it goes.

Also I may be testing with the dual extruder soon as I figure out how to hook it all up. and remove the quick change carriage and install the limit switches etc.

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Ken Gross will be eternally grateful.
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