Printrbot Plus Quick-Fit Upgrade v1/v2

by noreway, published

Printrbot Plus Quick-Fit Upgrade v1/v2 by noreway May 30, 2013


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The easiest way to upgrade your Printrbot Plus to Richrap's quick fit system by only replace the topplate of the original extruder mount.

You are still able to mount the original extruder without mounting the old topplate, or mount it with the supplied adapter the quick fit way.

During extruder development I like this solution, because I can easily switch back to a working extruder.

Update v2 Modifications

  • Integreated M3 threads to mount extensions like fans or Z end stops
  • Stronger adapter plate for the original extruder
  • Easier to print in separate parts, glued/melted togehter with acetone (works with ABS only)



  • Print the needed parts
  • v2 only: Glue/Melt the house onto the topplate with acetone
  • v2 only: Put in the five M3 nuts and fill up with in acetone disolved ABS
  • Dismount the original extruder and topplate
  • Countersink the two holes (see photo 2)
  • Mount the latch to the topplate with the two bearings, 30mm screw, two washers and lock nut.
  • Mount the topplate to the Printrbot Plus with the four 10mm screws and nuts

Adapter (optional):

  • Countersink the two holes in the adapter (the screws should not stick out!)
  • v2 only: Glue/Melt the reinforcement to the adapter with acetone
  • Mount the adapter plate to the extruder


  • 1x printed topplate (v2: topplate and house)
  • 1x printed latch by Richrap
  • 4x M4x10mm flat (countersink) head screws
  • 4x M4 nuts
  • 2x 624 bearings
  • 1x M4x30mm screw
  • 2x M4 washers
  • 1x M4 lock nut
  • 5x M3 nut (v2 only)

Adapter (optional):

  • 1x printed adapter (v2: adapter and reinforcement)
  • 2x M4x16mm flat (countersink) head screws
  • 2x M4 nuts

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This is super-cool. Can't wait to be able to swap hotends with ease.

Though now that I've printed and assembled this I realize there's no room for the inductive sensor I'm using as a Z endstop. Maybe I'll mod this and add a little loop hanging off the front-right edge as an attachment point.

I also wonder -- are two bearings actually required at the joint? Might be moddable to use a single bearing, which would save a small amount of weight.

In the last weeks I've improved to topplate to easier mount extention parts. I will use this to mount a fan to the M3 threads, maybe this will be useful for your Z endstop sensor too.

I think you can use this without any bearings. The Sketchup files are attached for modification, or just print to cylinders instead of the bearings.

How did you get the plug on your motor cable? I have a plus 2.1 and the cables go directly to the motor.

I had to cut them. The plugs are soldered male and female print headers with shrinking hose. If you rotate the connection by 180°, the stepper will also change the direction.