1 of 12

This is a work in progress!!!

OSE 3D Printer Extruder

Based on Chinese Prusa i3

We are in the process of documenting all of the parts using FreeCAD - use at your own risk!!!

2 of 12

The Extruder

This extruder has reliably printed for us for over three years. Compared to all other extruders we have seen here at London International Academy, this one is the most simple and most reliable. Replacing the filament takes just a few moments. We have only had one or two jams over that time (using PLA) These were easy to fix and did not require us to take the extruder apart. In the picture here, the one modification we have made is shown - mounting the cooling fan on one screw allows for easy access when replacing filament.

3 of 12

The Parts

Extruder Bracket 1 - Motor Bracket 3D Printed
Extruder Bracket 2 - Feeder - 3D Printed
Extruder Bracket 3 - Axis Mounting Bracket - 3D Printed
10mm (3mm ID) filament bearing
Motor Axis Filament Puller
Tension Spring
Screws - for Tension Spring (5mm), Motor Bracket, Bearing and Feeder
(remaining screws are 3mm - 10mm, 10mm, 20mm respectively)

4 of 12

The Parts - Continued

Large Aluminum Block
Small Aluminum Block - Hot End
Extruder Tube
Nozzle
Fan

5 of 12

Bracket 1 - Motor Bracket

Please see the FreeCAD file for Motor Bracket 1(and others) in the shared Google Drive folder

6 of 12

Bracket 2 - Bearing Bracket

This is an updated version of the Bearing Bracket used in the October 2019 build of the simple extruder.

7 of 12

The Aluminum Block and Hot End

The aluminum block acts as an interface between the hot end and the feeder. The hot end consists of a threaded tube, smaller aluminum block and nozzle which seem to be standard parts for many hot ends. Note that the aluminum block in the photographs has a set screw for an additional heater element; it was not included in this design as it does not appear to be necessary with the configuration we are using.

8 of 12

Bracket 3 - X-Axis Bracket (3D Printed)

The x-axis bracket is visible in the picture on the left.

The second cylindrical cut for the lower bearing did not seem to work at first. In the end, the two cylindrical cuts in the model were achieved by creating primitives, merging them in a union and then performing a difference operation with the main model. (Boolean operation in Part view)

9 of 12

Updated X-Axis Bracket - October, 2019

The X-Axis bracket was adapted to fit the D3D Universal axis for the October 2019 build of the D3D Extruder. There are three nut catchers designed for the M6 nuts used in the D3D Carriage. The bracket is also designed to attach to the motor and hold the Z-Axis probe.