MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

Download Now

Report as inappropriate

I couldn't get the MK5 drive gear easily in Canada, plus the smaller diameter (6.3 mm in my case) increases the filament drive force and resolution. And, with PLA at least, I get more than enough grip on the filament. 16 kg of pull works out to about 3600 PSI - that's at lot of pressure; I think the hot end will fail before you get that high.

These have turned out to be fairly reliable - neither of my two extruders have failed yet, and I hear Nophead had printed something like 18 + Mendels with his before it gave out. He did have a special hot end though, that put extra load on the mounting tabs, which eventually failed.

Things I'd l
ike to improve would include an easier mounting system (bolt under the stepper is hard to turn), and maybe a higher gear ratio like Adrian's version. Turning it sideways should allow a bigger gear and more Z travel.