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J-Head Mark IV Hotend
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J-Head Mark IV Hotend
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Product Description
This Mark IV Hotend is a clone of the original design, but maintains attribution. This is a high quality product, and the primary reason to source this overseas is because domestically produced J-Heads have such a long production schedule Read More
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keyboard_arrow_downnelson
5275
May 8, 2014
Hey everyone,
We’re happy to report that all of the orders have been shipped out!
Thanks again for the support guys. Make sure to share your experience with the J-Head Mark IV Hotend on Massdrop.
If there’s anything else we can do to make your Massdrop experience better, feel free to email us at support@massdrop.com.
J4son
13
Mar 26, 2014
If you guys pointed out that you have 4 drops for the most crucial, potentially difficult to find products to make a DIY 3D printer, you'd probably get a lot more attention on these drops..
Maybe a guide, even an extra page explaining the whole thing, w/ links for guides or potential builds/model files for the 3D-printable casing and assembly parts.. These drops aren't even in the same category at the moment, but seeing they all popped up within 2 days, you've had some intent in these drops.
It'd make one fantastic 3D printer, but you'd already have to be far more in the know about these particular products than I to actually go through with such an investment w/o prior research in a 7 day purchase window.
Maybe a guide, even an extra page explaining the whole thing, w/ links for guides or potential builds/model files for the 3D-printable casing and assembly parts.. These drops aren't even in the same category at the moment, but seeing they all popped up within 2 days, you've had some intent in these drops.
It'd make one fantastic 3D printer, but you'd already have to be far more in the know about these particular products than I to actually go through with such an investment w/o prior research in a 7 day purchase window.
vertigodragon
8
Mar 26, 2014
from RepRap Magazine Issue 3:
J-Head The J-head has been my default hotend for almost all my RepRap adventures, I have a lot of experience with it in almost all it’s revisions and I still use them today in various models and adaptions. Recently we have seen an explosion of J-head like designs, some are built to the same or similar standard as the original design (hot-Ends.com) and others fall way short of being even slightly usable. J-heads do use multiple materials and tend to have more parts than other stainless or minimal designed hot-ends, but a well made and built J-head can run for years and process tens of Kg of material without any significant issues. They do have some limits and unfortunately people do tend to melt them more often than you would expect (see above warning about cartridge heaters). J-Head MK2 - Still a good and solid design, I have a stock of them that only run ABS, no external cooling required, extrusion speed is limited to around 40mm/sec, but they run ABS well at 245 Degrees C J-Head MK4 - Longer and heavier than the MK5 with similar printing performance. J-Head MK5 - Compact and very light weight, great for Bowden extruders running PLA, needs to be fan cooled for best results. One thing that I have never been able to explain is that in all my printing with Nylon the J-head always seems to give better print results than any other nozzle I have used to-date. I do not know if it’s linked with the level of moisture in Nylon, or how the PTFE sleeve transports the material, or the level of compression, oozing or meltzone. I have a feeling it’s a combination of all these. So for Nylon I do prefer to use a J-head MK4/5 over anything else at the moment. Do watch out for cloned or badly manufactured J-head nozzles, I have had some during the year with various issues. Some requiring a massive amount of force to extrude, due to an incorrect machined nozzle hole length and others with sealing issues, incorrect use of materials and poor cooling capability giving a lot of oozing. Another interesting read for J-head background information is Brian’s J-head and ‘clone’ overview here.
Overall opinion and general recommendations 1. Best for Nylon Printing (245 Degrees C @ 30-80mm/Sec) (1.75mm recommended) 2. Good for general PLA printing (190-220 @ 10-80mm/sec) - Exceptional performance and print results at very low PLA temperatures down to 155 Degrees C. - needs active cooling of the PEEK 3. Do not overheat or the PEEK & PTFE can fail - Keep to under 250 Degrees, insulate the heater block. 4. ‘Industry standard’ Groove mount.
J-Head The J-head has been my default hotend for almost all my RepRap adventures, I have a lot of experience with it in almost all it’s revisions and I still use them today in various models and adaptions. Recently we have seen an explosion of J-head like designs, some are built to the same or similar standard as the original design (hot-Ends.com) and others fall way short of being even slightly usable. J-heads do use multiple materials and tend to have more parts than other stainless or minimal designed hot-ends, but a well made and built J-head can run for years and process tens of Kg of material without any significant issues. They do have some limits and unfortunately people do tend to melt them more often than you would expect (see above warning about cartridge heaters). J-Head MK2 - Still a good and solid design, I have a stock of them that only run ABS, no external cooling required, extrusion speed is limited to around 40mm/sec, but they run ABS well at 245 Degrees C J-Head MK4 - Longer and heavier than the MK5 with similar printing performance. J-Head MK5 - Compact and very light weight, great for Bowden extruders running PLA, needs to be fan cooled for best results. One thing that I have never been able to explain is that in all my printing with Nylon the J-head always seems to give better print results than any other nozzle I have used to-date. I do not know if it’s linked with the level of moisture in Nylon, or how the PTFE sleeve transports the material, or the level of compression, oozing or meltzone. I have a feeling it’s a combination of all these. So for Nylon I do prefer to use a J-head MK4/5 over anything else at the moment. Do watch out for cloned or badly manufactured J-head nozzles, I have had some during the year with various issues. Some requiring a massive amount of force to extrude, due to an incorrect machined nozzle hole length and others with sealing issues, incorrect use of materials and poor cooling capability giving a lot of oozing. Another interesting read for J-head background information is Brian’s J-head and ‘clone’ overview here.
Overall opinion and general recommendations 1. Best for Nylon Printing (245 Degrees C @ 30-80mm/Sec) (1.75mm recommended) 2. Good for general PLA printing (190-220 @ 10-80mm/sec) - Exceptional performance and print results at very low PLA temperatures down to 155 Degrees C. - needs active cooling of the PEEK 3. Do not overheat or the PEEK & PTFE can fail - Keep to under 250 Degrees, insulate the heater block. 4. ‘Industry standard’ Groove mount.
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