Printruder II - Rear Breech Loading

by juniortan, published

Printruder II - Rear Breech Loading by juniortan May 20, 2010


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This is a derivative of the super awesome Printruder II by Zaggo


  1. Incorporates a prototype design by Zaggo which allows direct access to pinch wheel - Easy flossing and access to the grub screws.
  2. Idler bolt is loaded at the M4 end, and then pushed towards the pinch wheel - this allows the following deltas:
    • No need to dismount the motor if you want to extract the idler block
    • Additional space gained allows now a 'guide' ramp for the post-pinch-wheel filament to be guided towards the heater element
    • Idler block is now more secure, as it is nowhere near the insertion channel when under load


Please see Zaggo's instructions for installation.


  1. This was designed also to accommodate/fit the 688 ball bearing used as the idler as the recommended ball bearing does not fit the pinch wheel I got from MBI. My 688 Idler block is here:


  1. You are welcome to modify anything, especially the filament guide ramp should you use a different sized idler bearing.


  1. V6 - 20 May 2010
    • amended part to better fit the 626 ball bearing for pinch wheel pulleys

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Woah, I just printed the prototype with the "direct access slot" a week ago, and here's already an adapted design :)

Concerning the idler: I actually had the loading mechanism on the M4 end in my first design. But I had problems keeping the idler centered (since it wasn't inside the lead groove over it's full length). Thus, I moved the loading gap to the other end (near the pinch wheel) in order to guarantee, that the idler is guided on its full length when in printing position.

heheheheheh zaggo, now you see how often I go back to your blog :-)

am now testing the impact of the rear mount to investigate how much movement of the idler affects filament feeding - will update once i get more info. it's really interesting how the cupcake, and the inherent limitations of printing overhangs, etc force us to think more creatively in how we design.