Printrbot Plus Vert. Shaft Extruder Mount for Bowden

by tdeagan, published

Printrbot Plus Vert. Shaft Extruder Mount for Bowden by tdeagan Jun 15, 2013
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While converting my Printrbot Plus to use Bowden tubes (dual extruders look out!), I decided that I wanted the extruder to sit at the top of the Z-Axis shaft rather than stand alone. It is paired with my Ubis Hot End Bowden Mount.

The Bowden tube gets pretty bent when the X- axis is homed and at the top of the Z-travel. It still works, but the additional friction doesn't help the ooze. Next design will put the extruder centered (and higher) on a cross bar linking the Z shafts.

This model is for the Printrbot Plus 12mm Z shaft, the OpenSCAD file has a parameter line: __printr_shaft = 6; // plus = 6, lc = 4__ . This is the shaft radius. Change it to 4 for the 8mm LC shafts.

I made this with measurements from the Printrbot and pneufit adapter: SPC-06-01 Pneumatic Push to Connect Fitting. This fitting uses a British Standard Pipe Taper Thread R1/8". Tap size is 8.4mm for this thread, but I'm 'self' tapping with the thread itself into the plastic. I'm using 9.45mm for the base and 9.15 for the tip (it tapers.) I bought these from eBay


I printed this (using a Bowden setup!) at .8 infill.

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What kind of pipe you use? it is a special one or anything I could find on a hardware store?

By pipe I mean the white plastic thing between the Push In Fittings, sorry but English is not my main language.

The material is called PTFE (Polytetrafluorethylene). It's a non-slip, rugged tube available from industrial suppliers, amazon or ebay. (http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=ptfe%20tube)http://www.amazon.com/s/ref=nb.... It might be available at a well stocked hardware store, but most people buy it online. There are special fittings (usually called 'pneufit') that are generally used to mount it. I have more detail at http://www.printrbottalk.com/forum/viewtopic.php?f=21&t=4112&sid=d4eb2df9345a2ac483e13d14bca4e979http://www.printrbottalk.com/f....

Thank you for your answer, I don't live on a "online" friendly country and so it is difficult for me to get hardware this way, I have to go to my local hardware store and see if I get lucky.

I'll give it a shot at your design, I think it is better for the X-carriage to work without the overweight.

I am also changing the threaded rods for 5mm ones and making Z taller, lets see how this puppy performs at the end.

Good luck! The material of the tube isn't critical, it's just that PTFE is extremely slippery (as well as chemically resistant and other nice to have qualities).

Take some filament with you to the hardware store and look for tube that allows the filament to slip through easily when it's bent. You also need some method to attach the filament to the hotend and extruder, as the filament is fed into the tube, it will put pressure on the walls and try to force it out of the connectors.

You also want the tightest fit to your filament you can reasonably get. As the filament enters the tube, the filament bends into the open space until it is forced out. This bend acts as a spring, storing energy, which worsens the 'Bowden ooze problem' since the stored energy forces the filament out the hot end after you've stopped driving it with the extruder. Don't get tube so small that the filament won't move nicely, but don't make it too big either.

Thank you for the tip, I have followed the links you have for the tubes and I have found other sizes too, I don't know which will work better, here are some size examples:

PTFE TEFLON TUBING inner_3.4m?m outer_3.8m?m
PTFE TEFLON TUBING inner_3m?m outer_4m?m
PTFE TEFLON TUBING inner_3.8m?m outer_4.2m?m

Or should I stick with the Tubing/Pipe OD 6mm ID 4mm you posted?

Also, will the Pneumatic ONE Push In you bought work only with the 6 mm tube or it can also work with the examples above?

The inner diameter should be slightly larger than the filament. I see most folk consistently using the 6mm OD, 4mm ID for 3mm filament. The fittings need to be matched to the outer diameter of the tube used (or else the press fitting mechanism won't work.)