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Simple Spool Holder for Printrbot Metal

by mgx, published

Simple Spool Holder for Printrbot Metal by mgx May 25, 2015
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Summary

The most compact way to add a filament spool "inside" a Printrbot Simple Metal.   

This spool holder prints in one piece and it fits the bed in the design orientation. As designed it should fit most spools (up to 92mm wide and 200mm diameter) but just in case you need to modify it I have included the OpenSCAD source as well.

You need need a M3 22mm screw to mount it (you will use it instead of one of the M3 16mm screws).

 Background: I wanted a spool holder that kept the spool in the vertical position (such that it doesn't unwind), in a secure way and something that doesn't take additional space on top of the printer. What I settled on is another cantilever principle holder (same idea as my t-slot spool holder) but this time I had to reuse one of the screws in the printer (one of the screws that mount the Z stepper has to be "upgraded" from 16mm to 20mm).  The two slots have triple purpose: 1) save some filament 2) increase tear resistance (shells along tear force) 3) aesthetics

Instructions

I printed mine at .25mm layer, 50% straight infill, 3 shells and seems plenty strong. It takes roughly 1 hour to print on Printrbot.

To mount: remove the one of the Z stepper M3 16mm screws in the back (look carefully at the pictures to see which one) and replace it with an M3 20mm. Better yet, use an 22mm screw and a washer.

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I originally had the spool holder mounted to the aluminum handle but was looking for a way to reduce the height of the printer. This seemed like an ideal solution. I printed it out in ABS and it looked great.

Unfortunately in my case, the bar must have sagged down as I noticed the spool now drags on the table. It still seems to deliver filament but there is certainly more friction.

I just used the SCAD file to increase the height by 1cm. That would seem to resolve the issue for me.

Just printed this super nice guide "Printrbot Simple Metal Z-axis Filament Guide" http://www.thingiverse.com/make:139509 many thanks to the creator http://www.thingiverse.com/thing:771588.

I think that this "Simple Spool Holder" can work very well together with "Printrbot Simple Metal Z-axis Filament Guide". I will try to test it.

Printrbot Simple Metal Z-axis Filament Guide
by robkar
Printrbot Simple Metal Z-axis Filament Guide

Very nice pictures, but it looks like it will cause a good deal of friction and tension on the filament?

There are many PB filament guides but I haven't tested them to see if they really help or just add more friction. In this case the simplicity might just work.

Nice design!

Extruders definitely like filament fed from the top. Two filament guides at the top of each Z rods will definitely help. One guide may create too much of an angle and more friction as you mentioned.

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