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Printrbot LC Bowden Cable Mod

by piit79, published

Printrbot LC Bowden Cable Mod by piit79 Sep 5, 2012
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13984Views 4198Downloads Found in 3D Printer Extruders

Summary

Parts to convert Printrbot LC extruder to bowden cable feed:
-- Extruder to bowden including X-idler mounting bracket and insert
-- Bowden to hotend
This is for 3mm filament.

Instructions

This is a partial derivative of http://www.thingiverse.com/thing:26963 with following changes:
-- Shortened base to fit width of LC X-carriage platform
-- Narrower base to save material and printing time
-- Taller block to accommodate for the length of the pneufit thread
-- M4 hotend mounting holes (like in Printrbot extruder) instead of M3
-- Removed base mounting holes nut traps (as the mounting is top to bottom, not bottom to top in LC)

I have designed the X-idler mounting bracket from scratch.
Includes extruder insert for easier filament threading.

Please see instructions of the original thing.

To modify the SCAD extruder to bowden model you'll need additional scad files from http://thingiverse.com/thing:18379 (jonaskuehling-default.scad, configuration.scad, functions.scad, metric.scad).

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This looks really cool, but i have the Plus v2.1, does this work with my printer?

Hi. What dimension is the Push fitting threads? 5mm, 1/4 or 1/8?

Thanks!

I'm keen to have a go at this. I would think the internal diameter of the PTFE tube would need to be as close to 3mm as possible.
Otherwise there would be slack, which will affect retraction, is that right?

Generally, I'd say yes. But you need to be careful - if the internal
diameter of the tube is too close to the diameter of the filament there
will be too much friction and it will make things worse.

I've got a newer versioj of the LC with 1.75mm...what do you think this would take for modifying it to that filament?

All you would need to do is get smaller PTFE tube (2mm internal dia), smaller pneufit adapters and possibly adjustment to the holes in the printed blocks...

What hardware tricks and/or slice settings did you use to get this performing nicely? I'd imagine speed and retraction are the main variables at play here.

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.

It's a teflon tube - it's stiff and very slippery (low friction). You can find them easily on eBay.

Can this be used to mod the printrbot plus? A friend of mine just got one and this would be an excellent upgrade.

Possibly. The extruder mount might need to be changed.
Please keep in mind that I was experiencing quite a bit of oozing - which means that the plastic would still be extruded after the extruder stopped. The design needs to be optimized - I wouldn't recommend it for a beginner.

That's a nice hack!

Thanks, but all credit goes to sponnet :) I just need to figure out how to combat oozing/stringing with the bowden... I think there might be too much axial play in the pneufit adapter. I'll try to use a different attachment (threaded nut/printed clamp).

 Check in the Rostock/Delta Robot google group. I think some one over there mentioned using air or hydraulic push-tube fittings.

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