Kitset of Notre-Dame de Reims.
Designed to be printed on UP! Plus.
62 pieces.
Drawn in Solidworks 2012.
All parts drawn from scratch referencing L'Instant Durable paper model, internet photos & books.

This extruder upgrade for the Replicator 2 replaces the Delrin plunger with a pinch
roller. Using the spring specified in the parts list below, this pinch roller provides about 60N of force on the filament, which provides enough driving pressure on the filament, in combination with the stepper drive gear to prevent stripping.

Unlike other designs, this one uses a pin style bush on which the pinch arm rotates. This provides a large lower friction surface for the pinch wheel arm to rotate on, and allows the mounting screw to be fully tightened so there is no chance of it working loose.

I have extensively tested this design, which has evolved through numerous iterations,
and I have also tested several different springs. With the specified spring I can hold the drive gear with my thumb and pull hard on the filament without it stripping, and its done numerous unattended prints with troublesome clear PLA filament - so I can confidently say it works.

UPDATE (Mar 4th 2013)
In v7 I have added a filament guide slot to the bottom of the backing plate. I added a spring channel to hold the spring in place and stiffen the backing plate. I redesigned the arm geometry to make it pivot better - compressed and uncompressed. I altered the pin so one side now holds the base plate down against the stepper motor.

This extruder upgrade was designed using an ACIS solid in Shark FX/ViaCAD (vc3 file included) so will behave well with Makerware, ReplicatorG and skeinforge. There are also STEP files that can be imported into other CAD programs.

Because a few of you have asked - Paypal donations graciously accepted - whpthomas at yahoo dot com

A printable model of GlaDOS that functions as a ceiling lamp. It also has servo mounts and can function as a 4 DOF robotic arm.

(Now with the controller included in the downloads)

My first upload! This is a 3D periodic table, with the relative height of an element representing its density. (The first of many "periodic trends" I hope to print.)

This small device traps dust in a small sponge before it enters the extruder. In some cases it can also be used to easily lubricate the filament just before it is extruded.

The adapter is designed to fit the Replicator (1), Replicator 2 and Replicator 2X extruders.

Protecting your 3D printer's extruder from foreign particles is an important part of keeping the machine maintenance-free. This adapter makes it easy to keep the filament clean.

Lamborghini Super HQ

This is a fully modular snap-fit (no glue required) model of an Airship. It is the vanilla base for a series of absurd mashups that currently includes a Trireme and a Saturn V rocket. Designed for 3D print, it comes in two flavors: solid and shell.