Friday, May 11, 2012
J-Head Hot-Ends Shipped Out For Field Testing
In addition, I shipped out two "Mini" J-head hot-ends, for testing. The Mk II Mini J-Head looks identical to the MK V. However, internally, it is designed specifically for 1.75mm filament and I will be updating the Wiki Page and adding more information about it in the near future.
Unlike the Mk IV-B 1.75mm hot-end, the Mk II Mini J-Head is not a conversion. It has quietly been in development for several months at this time. The Mk II Mini J-Head was already very similar to the Mk V and I decided to make it identical, externally, in order to reduce the inventory required to produce either hot-end. In many respects, the Mk V (3mm) hot-end is basically a Mini J-Head adapted for 3mm filament.
Internally, the Mini J-Head uses a PTFE liner that has an OD of 4mm and an ID of 2mm. The means that there will no longer be a custom machined liner used to convert a standard hot-end to 1.75mm filament. The brass nozzle is also different, internally, in order to accomodate the smaller filament size. Some of the testing, and lessons learned, from the Mini J-Head were used in the development of the Mk V version of the standard J-Head hot-end.