Replacement Nozzles for the Mini

[mrvanes]

And there it is. A bit stressful I must say to touch these delicate parts but I think I managed without breaking anything.
IMG_20170120_111209.jpg
The procedure to adjust Z Home offset is

M28 Z         // Home Z without Bed offset
M206          // Check Z Home (should be 159 for unmodified Mini)
M206 Z-1.0    // Add 1.0mm to the nozzle size (you tell Mini: you're at 158.0 now)
M500          // Save settings in EEPROM

Now, with stock Lulzbot Cura start gcode the nozzle dives comfortable depth into wiper, even after powercycle.

update: Hmm… something fishy is going on. The firmware wipe (on failed washer probe) is deeper than the start gcode one. Back to the drawing board.

I just got an e3d steel nozzle for my mini and am thinking I’ll get to try installing it today. Before I embark, though, could you confirm that all you did was physically install the nozzle and then execute that gcode? No subsequent changes to scripts or configuration.h or anything?

Thanks!

First: “M28” Z should be “G28 Z”!!

That’s exactly what I did, but you should be careful and do a manual home and probe for all axis afterwards (G28, G29) and then do a “G1 X15 Y15 Z10”. This will bring the nozzle to 1cm above the front left corner of the bed. Then, step-by-step lower the nozzle by going down on Z, using “G1 Z8”, “G1 Z4”, “G1 Z2”, and watch the nozzle distance to the bed. “G1 Z0” should exactly kiss the bed, Z2 or Z1 should give you a good idea about that. If that’s not the case, you should adjust Z Home offset so that Z0 kisses the bed.

BE CAREFUL WITH THE NEW 1.1 Marlin FIRMWARE.
Aleph Objects is preparing a new release of Marlin for all of their printers, uncluding the Mini and the behaviour of M206 has changed and does NOT do what is described above anymore, by-design:

Temperature Error

We have been trying, unsuccessfully to get through a 6 hour print for the last week. Just when we get the feed issues and the adhesion issues sorted out we are beginning to get regular temperature errors that stop the print. We get low temp and high temp errors… Does anyone else have this issue? Has anyone else found a simple solution?

The only options you have with this new firmware is compiling the code yourself after adjusting the code with my changes (which I do, because I like the old behaviour) or adjust your start g-code to accommodate for the Z offset using G92 like Marcio suggests in this post:

Temperature Error

We have been trying, unsuccessfully to get through a 6 hour print for the last week. Just when we get the feed issues and the adhesion issues sorted out we are beginning to get regular temperature errors that stop the print. We get low temp and high temp errors… Does anyone else have this issue? Has anyone else found a simple solution?