What would be a good upgrade for my hot end?

This is the printer I have. [makemendel.com]

This hot end has issues, It doesnt hold temp when printing fast and It jams often.

I'm looking for something I can have at my house and ready to print in under a week if possible. I've looked at the hot ends from china on ebay and they are a good price but I cant wait a month for shipping. 1.75mm filament prefered.

Sugestions?

Edited 1 time(s). Last edit at 03/19/2013 07:27AM by hendo420.

How fast are you trying to print?
ABS or PLA?
What hotend temperature are you using?

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

The current PLA I have needs 225c to look good. My current speeds are 65 perimeter and 90 fill.

I can go higher speeds on lower prints but if I go higher on larger prints I end up with a hot end cooling down during printing causing problems.

The resistor in the hot end is 3w, its only 4.5mm, all of the resistors I have found that are possible upgrades are 5.5mm so cant find an upgrade that will fit. I just want to get a hot end to replace this shoddy thing.

I am not sure of the size of the resistor, but check this one out. Lulzbot 6.8 Ohm resistor

try insulating the heater block. I wrapped my jhead in about 20 layers of ptfe plumbers tape, then a bit of kapton to hold it together. much more consistant temperature now. Might work for you too.

That looks like an old jhead design in the photo. The mk5 is fantastic and I would thoroughly recommend - however it is much shorter so you will need to work out if this is ok!

shorter is fine as long as the heat is under controll, Ive got 2 fans on my hot end to stop jams atm.