Different Hotends  

RE: Different Hotends

For those interested, I successfully installed a Mosquito on my Mini based on community provided designs. Wasn't too hard at all. (minus drama salvaging the original heater / thermistor...)

(That's malcolm's remix of 4nthonylin's design from the prints archive here printed in 3DXTech ezPC)

RE: Different Hotends

Hi All, 

After a good run with the mosquito, I decided to switch to a Revo Micro. So far I am loving it. The only issue I am having is that the offset of the mosquito still seems to be stuck in the settings somewhere. I consistenly miss the prime line. I removed the custom lines from OctoPi. Is this stored withing the firmware anywhere ? 

Any ideas ?

Thanks

RE: Different Hotends

It's in your printer profile in your slicer in your start gcode.

I'd recommend just recreating your printer definition to be stock mini.

RE:

Thanks for the tip, I did look there and I see no reference to it. I'll probably just go ahead and a stock Mini back . I pasted it here in case its something I missed ?

M862.3 P "[printer_model]" ; printer model check
G90 ; use absolute coordinates
M83 ; extruder relative mode
M104 S170 ; set extruder temp for bed leveling
M140 S[first_layer_bed_temperature] ; set bed temp
M109 R170 ; wait for bed leveling temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M204 T1250 ; set travel acceleration
G28 ; home all without mesh bed level
G29 ; mesh bed leveling 
M204 T[machine_max_acceleration_travel] ; restore travel acceleration
M104 S[first_layer_temperature] ; set extruder temp
G92 E0
G1 Y-2 X179 F2400
G1 Z3 F720
M109 S[first_layer_temperature] ; wait for extruder temp

; intro line
G1 X170 F1000
G1 Z0.2 F720
G1 X110 E8 F900
G1 X40 E10 F700
G92 E0

M221 S95 ; set flow

Posted by: @j-e-hahn

It's in your printer profile in your slicer in your start gcode.

 

I'd recommend just recreating your printer definition to be stock mini.

RE: Different Hotends

Replace the "intro line" section with the original Gcode. If memory serves, this is the original code: https://m.imgur.com/zZq2uqA

RE: Different Hotends

So I think I figured it out,  as per the post below, in my profile on Octoprint, I didn't specify a custom bounding box for the Mini and the purge line sits just outside. Hopefully this helps someone else out.  

https://forum.prusa3d.com/forum/postid/212274/

RE: Different Hotends

well the saga continues, even with the right bound box , the prime line doesn't print on the bed.... completely stumped at this point

RE: Different Hotends

Thanks, I just saw this, will give it a try. 

Posted by: @benji

Replace the "intro line" section with the original Gcode. If memory serves, this is the original code: https://m.imgur.com/zZq2uqA

RE: Different Hotends

Hey guys, so I put a revo micro on my mini a couple of weeks ago and have had nothing but problems with it. I have since decided to get a new hotend to try and jumped the gun and ordered a mosquito since it seems to be quite popular on here. However, the copperhead hotend looks pretty nice as well which had me wondering if I have made the right choice. What are yalls opinions on hotends for the mini?

When it comes to mounts for the mosquito, is Malcolm's version the best / most updated one?  I was thinking about printing his mount version along with 4nthonylin's fan shroud and low profile heatbed cover. 

RE: Different Hotends

What kinda problems are you experiencing I have mosquito hotend and was looking to swap it to a Revo since with the mosquito you lose a lot of print space and the fan shroud alway hits the screws in the back.

RE: Different Hotends

Ok so I just want to say upfront that I am no pro at 3d printing, I just started back in early November but I do read a lot of the forums and try to learn from other people’s mistakes / experiences.  I feel like I have a decent understanding of most things when it comes to 3d printing, but I know there is always more to learn. When it comes to the revo micro though, I believe it has heat creep issues. According to some comments I have read on reddit and prusaprinters I am not alone in having these issues or similar ones. After I installed it I ran through the calibration stuff like the instructions said to test the heater, thermistor, and fan which all went great. However, when trying to calibrate my Z height is when I started running into issues. I always print a 60mm x 60mm square to adjust my Z height and after doing this for the first time with the revo micro I thought I had it pretty close to perfect. However, when trying to print the same calibration square for a second time the Z height was nowhere close to perfect and definitely not where I had left off after printing the first one. I then printed the same square 5 times in a row and the Z height looked different every single time I printed it. Next, I started noticing that when printing an object that the first few layers would look good and then it would start under extruding and even led to a complete clog once. I have tested it with a 0.4mm and a 0.6mm nozzle and got the same results. I have calibrated my Bondtech extruder to make sure that wasn’t the problem. I have played with the tension on my extruders idler screw as well. I checked my ptfe tube for any friction too and also played with different extrusion settings. Something else I noticed is that I get a lot of filament oozing out of my nozzle when a print is done despite having added a 6mm retraction in my ending gcode. I am going crazy trying to troubleshoot this and figure it out. I’m all ears if anyone knows how to fix this though and open to suggestions.

RE: Different Hotends

Working my way through the thread. My mini is acting up.   Tube issues and now the thermistor is throwing values all around before bed levelling and stopped a print due to temps.  Prusa is out of replacement parts or kits, and no idea when they'll get in.  

The biggest thing I see is making sure the new thermistor is set up for the same values vs temps and if the connectors will work?

Was thinking about a E3d Revo 6, which I might update my Mk3s also to. I think I might of tweaked the thermistor leads when changing nozzles, so that should take care of that damage path.

The REVO 6 kits don't come with a thermistor, right?  What is the right thermistor to plug&play (in stock now) for a Mini?

While I'm looking for replacements, what is a good resource for setting up a hot end with a thermocouple.  I have a need to print at higher temps, but only small 30x50x1.0mm plaques and simply running filament through at different (higher) temps to look at flow properties so I want to see what the options are for tweaking a Prusa for this limited application.

Thanks!

RE: Different Hotends

The thermistor is integrated in the heater on the Revo. I think the Revo 6 is a straight swap on the Mk3. Either one on the Mini is going to require new parts printed, so you might as well go with the Micro and take advantage of the smaller size and lighter weight. The Micro is tiny, I have on installed on my Trident.

Install on the Mini looks really easy. Here's E3D's docs: https://e3d-online.zendesk.com/hc/en-us/articles/4415484403473-Revo-Micro-Prusa-Mini-upgrade-guide

RE: Different Hotends

Thanks on the fan.  All the online marketing images just have two cables, but if you look at real unboxing images, there are three.  Got one on the way!  I’ve had them new probe to go Mini+ for awhile, got a good reason to replace it all at once. That E3D link is great, thanks for that.