3mm to 1.75mm filament converter

by daveseff, published

3mm to 1.75mm filament converter by daveseff Apr 10, 2013



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I love my new extruder on my SteelBug (https://solar1.net/drupal/Steel_Bug). But I have dozens of 3mm filament in various colors. This machine was built to convert (re-extrude) my 3mm fil to a 1.75mm fil.

The bottom spool in this picture is an existing roll and was just placed there for demo purposes.


This was made from 1" square steel tubing from the hardware store. this could easily be constructed with aluminium extrusion but steel tubing is cheap, and I weld. The extruder is mounted on 1/4" steel plate welded to the tubing.

The extruder is from an old printer and is controled by some old Thingomatic electronics. Basically set you temp based on abs/PLA in replicatorG and manually extrude for a long time.

My receiving spool may need a stepper driver to wind up the output. That will have to be for a future date. For now I just babysit the machine.

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Hi. I am having the same problem and your solution is good. Is it worked?

It worked but was not consistent. I had an issue due to the gravity feed of maintaining a constant thickness. This design will most likely be revamped in the future

What nozzle was used and what speed on the extruder? Also what is the diameter of the extruder?

It worked but was not consistent.

Maybe we need a unit like this with three extruders .. two for different source materials that extrudes ~1.75mm/2 to feed a third that outputs the final 1.75mm diameter? Create your own colors, or mix materials of different properties?

I think it would be better to use plastic granulat to this

I changed my printer to 1.75 and had a lot filament 3mm saved.

It's fairly accurate. I've machined the nozzle a .070 and there are no burrs. I suppose I could run it with a few passes, but my printer is quite forgiving. Once in a while I get an air bubble but that is usually right at the start so I just cut that off.

How precise is your output?

I wonder if you were to run the same filament through several times if you could decrease the variance in filament diameter.