Glass Nozzles

Mendel Build Documentation

Index | Installing RepRap on your computer | "Official" Electronics | CAM Toolchains | Microcontroller firmware installation | Mechanical construction | Electronic wiring | Commissioning | Mechanical Drawings

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Mechanical: Overview | Mendel solid model files | Procurement | Preparation of materials | Assembly notes | Extruder | X-axis | Z-axis | Y-axis | Circuit boards | Frame | Squaring the axes

Glass Nozzles

Release status: Experimenting

Description	Glass Nozzle to replace PTFE/Brass combination
License	GPL
Author	User:Mike Bushroe
Contributors
Based-on	Repstart
Categories	Extruders
CAD Models
External Link

The Glass Nozzle page is a tutorial on how to build and mount Glass Noxxles

One of the most frequently described failure modes for a working reprap is an extruder failure. This often occurs because the brass nozzle works loose in the PTFE thermal break, or slight mismatches in drilling create choke points that jam. Using a single material for both nozzle and thermal break would greatly simplify the construction of extruder nozzles, eliminate the drilling mismatches, and reduce or eliminate the nozzle working loose from the thermal break. Recent discussions about reducing the heat flow from the nozzle to the ABS mounting bracket pointed out that even stainless steel, a very poor conductor of heat, was still way to good for any normal length nozzle. The only way to reduce the temperature of the stainless steel tube in that short a distance is to add many washers or other heat sinks to cool the metal before it melts its mounting bracket. But this cooling wastes lots of power, and releases heat inside the reprap where it does no good. The only solution so far is to use glass or ceramic nozzles. Ceramics can be machined, but not formed or molded,and we are limited to ceramic nozzle shapes already produced.

The glass can purchased in bulk and worked with a welding torch to create a very orifice. It can be made easily in two forms, one a blunt nosed tip in which the glass closes off the interior hollow by surface tension, and creates a blob tip that can be ground down until reaching a funnel shaped section, and then ground further until the desired orifice size is reached. The other is to heat the glass tubing in the middle and draw it out, just like making a micro-pipette. This can also produce small orifice sizes, but leads to very thin walls at the tip also. The blunt nosed nozzle is very strong and should be able to resist breakage even after a Z axis crash. The drawn tip is not a strong and may break. Both types can be fitted with a flange at the other end to make a simple saddle clamp a secure mount, or left as is for compression fitting mounting.

This page present methods to wire up a glass nozzle, and to build simple mounts for them

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Wiring up a blunt nosed Glass Nozzle

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Working Notes. This is a stub!

Step 1 Here is a photo of the material needed to start. A glass nozzle, of course. This one has a flange and index key as well. Scissors to cut the Kapton tape as well as the nichrome wire. A thermocouple has been prepared from extension wire by twisting and soldering the tip. A multimeter that read both ohms and degrees C from a Type K thermocouple.

Step2

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  Full MediaWiki
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