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Cherry Pi III Is Available

Posted by AndyCart 
Re: Cherry Pi III Is Available
May 01, 2015 02:13PM
Just had a play with tinkercad and made this 360 cooler,Seems to work well.

Re: Cherry Pi III Is Available
May 01, 2015 02:45PM
That looks great. Does it blow all around the nozzle?
Re: Cherry Pi III Is Available
May 02, 2015 08:15AM
I looked at that and thought that it looked very heavy to put on the effector... then I realised that it's mostly empty space... I just worry about the fan flapping around on the top when the effector's changing direction rapidly. However - in reality - I'm sure there's no problem!

Edited 1 time(s). Last edit at 05/02/2015 08:43AM by David J.
Re: Cherry Pi III Is Available
May 04, 2015 04:35AM
Yes it does blow all the way round and hasn't fallen off or messed up the effector yet.I put the fan over the extruder so to keep the weight in the middle
Re: Cherry Pi III Is Available
May 04, 2015 04:40AM
I am having major problems with strands I have tried loads of combinations in retraction settings and im still getting them.Any suggestions

Re: Cherry Pi III Is Available
May 04, 2015 04:47AM
Which slicer are you using? I find that I get a lot more stringing with Slic3r than with Cura - in fact, I rarely get stringing with Cura.

I'm sure that there are settings that can be changed in both slicers - but when you have one that gives nice results, and one that doesn't - guess which gets used!
Re: Cherry Pi III Is Available
May 04, 2015 05:13AM
Im using cura,Could you send me your settings.
Re: Cherry Pi III Is Available
May 04, 2015 07:42AM
Probably not much use to you at the moment as they're all for my Prusa i3 - my Cherry Pi is being upgraded to a Duet board just now.

However, have you selected the "minimize crossing perimeters" checkbox in the "Extrusion" setup? And also "Enable retraction"? The first one certainly had an effect on stringing when I was playing around, although it did make the job time a bit longer.
Re: Cherry Pi III Is Available
May 04, 2015 07:48AM
Hi group, we bought a cherry pi back in september well, we're having our first major issue, I was changing the PLA over and upon starting a print. it seems the Z axis has lost it's placment, it is no longer printing on the bed but like 10mms away from this. I have tried a multitude of things, renistalling software, changing computers etc. tried it with repetier and cura, same issue all round.

i'm thinking it is EEPROM related but can't find away or know what to change-
Attachments:
open | download - IMG02505-20150504-1425.jpg (361 KB)
Re: Cherry Pi III Is Available
May 04, 2015 10:49AM
I have enabled retraction but cant find minimize crossing perimeters,Where is it in cura.
Re: Cherry Pi III Is Available
May 04, 2015 11:45AM
Quote
mrorange26
I have enabled retraction but cant find minimize crossing perimeters,Where is it in cura.

It's in the print section under Extrusion

Doug
Re: Cherry Pi III Is Available
May 04, 2015 11:56AM
What Doug said.

If I've understood it correctly, It tries to keep the nozzle over the print as far as possible, instead of taking the direct route. If any threads are left behind they will tend to fall onto the plastic already deposited. The downside is that the nozzle has to fly all over the print, thus taking more time.

Edited 1 time(s). Last edit at 05/04/2015 12:30PM by David J.
Re: Cherry Pi III Is Available
May 04, 2015 02:27PM
Quote
mrorange26
I have enabled retraction but cant find minimize crossing perimeters,Where is it in cura.

Just a thought - I use the Cura plug-in for Repetier-Host. Is that what you're using? The reason I ask is that I've just looked in the stand-alone version of Cura and I couldn't find the 'minimise crossing perimeters' in there.
Re: Cherry Pi III Is Available
May 04, 2015 02:50PM
Quote
pringleman
Hi group, we bought a cherry pi back in september well, we're having our first major issue, I was changing the PLA over and upon starting a print. it seems the Z axis has lost it's placment, it is no longer printing on the bed but like 10mms away from this. I have tried a multitude of things, renistalling software, changing computers etc. tried it with repetier and cura, same issue all round.

i'm thinking it is EEPROM related but can't find away or know what to change-

Just sent you a link to my calibration guide. It's also available further up the thread
Re: Cherry Pi III Is Available
May 04, 2015 11:50PM
IM just using cura on its own that's why I cant find it.
Re: Cherry Pi III Is Available
May 05, 2015 01:52AM
Quote
mrorange26
IM just using cura on its own that's why I cant find it.

Strange that they put some useful functionality in a prominent place in the plug-in, but hide it in the main app...
Re: Cherry Pi III Is Available
May 05, 2015 03:23AM
Quote
mrorange26
I am having major problems with strands I have tried loads of combinations in retraction settings and im still getting them.Any suggestions]

Don't be afraid to go higher than 5mm retraction, despite what the defaults are in most slicers. Bowden setups need more retraction, due to slop in the system. Also, most firmware has acceleration limits that also apply to the extruder. My working settings are 5.5mm retraction @ 100mm/second, with the firmware acceleration adjusted accordingly.

Another thing to check is the tightness of your pneumatic connectors at both ends of the Bowden tube if you're using them. Some play could pop up in those with the change of direction during retract, and it may help if you can ut some king of locking shim or even a cable tie under the release ring to hold it all the way up.....

Edited 1 time(s). Last edit at 05/05/2015 03:24AM by vreihen.
Re: Cherry Pi III Is Available
May 05, 2015 04:37AM
You might also want to try with an older version of Cura. I've noticed some strings appearing in my prints since I moved to V15. Try going to a V14, without changing anything else, and see what happens.
Re: Cherry Pi III Is Available
May 06, 2015 11:08AM
If the ball sockets on the effector and carriages weren't great and the balls didn't fit snugly into them what would you expect the printer to do? I have an issue with repeatability in the bed level, it appear to be different every time I home. I don't have any play in the frame, the belts are tight and don't appear to be slipping. When I manually calibrate and then home, come back to the same place the x, y and z tower offsets change. I was thinking that the limit switches might be bad (not repeatable) They are firmly fixed in place, but I'm not convinced the balls fit as snuggly in the sockets as they should. Does anybody think this might cause the issue?

Thanks

Matt
Re: Cherry Pi III Is Available
May 06, 2015 02:42PM
Hi Matt

Could be. Why don't you get an 8mm ball end mill and gently ream the sockets to ensure a snug fit?

Andy
Re: Cherry Pi III Is Available
May 06, 2015 03:09PM
I didn't know you could get such things smiling smiley I have just ordered one from eBay.

Thanks

Matt
Re: Cherry Pi III Is Available
May 07, 2015 08:42AM
Be VERY gentle with it - they are very sharp and tend to dig into the plastic if you're not careful. yawning smiley
Re: Cherry Pi III Is Available
May 07, 2015 08:45AM
Good to know, so loading the bit into my drill probably not a good idea smiling smiley
Re: Cherry Pi III Is Available
May 07, 2015 08:50AM
Quote
Matt,Wheatley
Good to know, so loading the bit into my drill probably not a good idea smiling smiley

If you have a good drill press with tilting table you could them feed it very gently DO NOT HOLD IT BY HAND unless you want to lose some skin or worse.

me I think i would get a hand chuck or similar for the job.

Doug
Re: Cherry Pi III Is Available
May 07, 2015 09:18AM
I held mine by hand - it's a real struggle to stop the mill digging in. I wouldn't put it into any sort of electric drill - hand-held or a drill press - as everything would happen too quickly. If you have a drill with a removable chuck then that would be ideal for manually turning the mill (as Doug said). Take the chuck off, insert the ball mill, GENTLY turn the mill by hand in the hole. Slow, slow, slow is the order of the day.

Really, you're only trying to remove the high spots without taking any of the main plastic from the part.

And yes - you really risk your skin trying to rotate a brand-new mill by hand! The cutting edges are as sharp as razors.

Edited 1 time(s). Last edit at 05/07/2015 09:20AM by David J.
Re: Cherry Pi III Is Available
May 07, 2015 09:20AM
I'm recalibrating my CPIIIs again as parts were printing too small. I've noticed that when I manually step the Z axis by 0.01mm, I have to press the button 12 or 14 times before the carriages move up and when they do they jump up the accumulated amount in one go. Then I have go down a similar amount before they move again. I've also noticed when calibrating, that having got the paper lightly gripped on say the X tower, that if I move to another tower and then go back to X the paper will be either too loose or too tight. Is this normal?

The belts are suitably tight and the carriages won't move if I hold the motor pulley stationary, so it's not slop or backlash. I've checked configuration.h and the motors are set for 80 steps/mm and 200 steps per rev, with 16 micro-steps.

Could this be caused by having the motor current too low?

Any help would be appreciated.
Re: Cherry Pi III Is Available
May 07, 2015 10:45AM
I have a die tap handle I'm hoping the bit will fit into, I'm hoping that will do the job.
Re: Cherry Pi III Is Available
May 09, 2015 06:41AM
A question for dc42 (or maybe anyone else who has a Duet board):

I'm looking for somewhere to plug in my E3Dv6 hot-end fan, which should be a continuous 12v at low current. Looking at David's wiring, he has a plug on pins 31 & 35 of the 'motors and extruder loom' header (31=GND, 35=E0 V+) - is this a connector for a fan? It's the connector right next to the extruder motor and X end-stop connectors (click on the picture to enlarge the view). The schematic suggests that it should be V_IN, which in my case will be 12v.



If not here, is there anywhere else I can connect to? If there's nowhere convenient on the board then I'll have to create a 12v distribution point from the incoming power wiring.

UPDATE: I've just been reading the thread about David's IR Z-probe, and he shows the hot-end fan wired exactly as I described. So - question answered! smiling smiley

Edited 3 time(s). Last edit at 05/09/2015 07:41AM by David J.
Re: Cherry Pi III Is Available
May 09, 2015 06:54AM
Thanks for the info andy I went back to cura 14 and my stranding has gone.
Re: Cherry Pi III Is Available
May 10, 2015 04:14AM
I must say that it's a lot easier to wire up the Duet board in a tidy manner, unlike the old RAMPS board!



Basic movements and settings are going well so far. smiling smiley
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