Mini J Head Nozzle
This page is a development stub. Please enhance this page by adding information, cad files, nice big images, and well structured data!
Release status: Concept
| Description | Mini J-Head Nozzle, Thermal Barrier, and Mounting Plate based on the J Head Nozzle.
|
| License | GPL
|
| Author | |
| Contributors | |
| Based-on | |
| Categories | |
| CAD Models | |
| External Link |
Contents
Introduction
NOTE: This page is under construction. More pictures, descriptions, etc., will become available when they are ready. The current pictures do not show a finished nozzle tip as it will be identical to previous designs. When these pictures were taken, it was a proof-of-concept for the thread sizes, internal dimensions, fitting of the parts, etc.
This nozzle has been designed as a drop-in replacement for the RepRap Universal Mini Extruder hot end.
Advantages
- Internally, the filament path is identical to that of an already proven design.
- If necessary, the PTFE liner can be replaced by using an off-the-shelf piece of PTFE tubing.
- A resistor is used as a heater. There is no need to wrap nichrome wire.
- Heat transmission is improved as there is no thermal junction where a separate heater screws onto the nozzle.
- Since there are no press-fit parts, it is easier to disassemble.
Disadvantages
- The brass nozzle requires considerable machining.
- Due to mounting considerations, this design has more parts than the standard J-Head Nozzle.
Parts List
| Quantity | Part | Description |
| 1 | Mini J-Head Nozzle | Machined Brass Nozzle/Heater Combination |
| 1 | Thermal Barrier | Machined PEEK Insulator |
| 1 | PTFE Liner | 4mm OD, 2mm ID PTFE Tubing |
| 1 | Mounting Plate Insulator | Internally Threaded PEEK Insulator |
| 1 | Mounting Plate | Rectangular Metal Mounting Plate |
| 1 | Heater Resistor | Axial, 5.6 ohm, 1%, 5W (UB5C-5.6-ND) |
| 1 | Thermistor | 100K (B57560G104F) |
Machined Parts
Mini J-Head Nozzle
Material: Brass Bar Stock, 5/8" Square Or 5/8" x 1/2" Rectangular, ? Long
Note: The machining process can vary depending upon available machinery and tooling. The minimum machining requirements are a metal lathe with a 4-jaw independent chuck.
- Cut a piece of brass bar stock ?? long plus enough to adequately hold the stock in the lathe.
- On the brass bar stock, find the center of the axis of the nozzle. This can be done by various means ranging from using a milling machine to using marking fluid, a height gauge, and a surface plate.
- Mount the brass bar stock in a 4-jaw chuck on a lathe. Adjust the chuck so that the nozzle axis is on center.
- Turn the threaded end of the nozzle down to 0.375 +0.000 -0.004.
- MORE INSTRUCTIONS COMING SOON.
Thermal Barrier
Material: PEEK, 8mm Round
PTFE Liner
Material: PTFE tubing, 4mm OD, 2mm ID
- Cut an approximately 30 degree (or greater) taper on what will be the hot-end of the PTFE liner.
Mounting Plate Insulator
Mounting Plate
Assembly
