Another ultra-light printing head

A project log for Folds and Hinges Technology to Make Mechanisms

Engraving by CNC a special composite, the Hylite, to create folds and hinges. Zatsit, so made, is on Kickstarter until oct 5, 2018. Hurry!

marc-peltierMarc Peltier 07/25/2018 at 17:114 Comments

I continue to explore the compact 3D print heads, with the integrated extrusion function.

This one weighs only 29g, and is more accurate and robust than the previous one published.

But it is not easy to build at the prototype stage, because of a difficult silver solder. In mass production situations, however, things could be simpler with another technology.

This version could be declined in several extrusion paths, but only one extrusion motor, remote. If I can keep it light enough (I hope about 40g), it would be a major advance for delta printers, which will also be able to print objects in several materials including TPU.


Marc Peltier wrote 07/26/2018 at 12:29 point

Both shafts are free to slide laterally, and thus center, in the presence of the filament, on the extrusion path. But it is not the shafts that turn, it is the POM crown pinions that turn on the polished steel shafts. Self-centering on the filament path is for both directions.

Green O-rings are only a slightly lighter alternative to coil springs.

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Mark Rehorst wrote 07/27/2018 at 11:49 point

If the gears can spin on their shafts, what keeps them from sliding along the shafts and out of contact with the worm gear?

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Marc Peltier wrote 07/27/2018 at 13:50 point

The filament.

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Mark Rehorst wrote 07/26/2018 at 10:50 point

Interesting work.  Does that use a single worm gear to drive both of the hobbed gears?  What keeps the green rubber bands from walking off the ends of the shafts?  The shafts are turning in opposite directions, so the rubber bands are not working as belts- that means the shaft is turning against the friction of the rubber band.  How long will the rubber band last?  

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