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G&C Printer

Posted by filipeCampos 
Re: G&C Printer
February 29, 2016 11:37AM
That looks good, Filipe.

I thought about building one of those CNC machines, but I just don't have anywhere to put it. sad smiley

I can also add a late update: when I first built my G&C printer I decided that it was too much trouble to print the 4 panels that cover the base (my Prusa couldn't manage the full 200x200mm) so I made one out of acrylic sheet. After a while I decided that the acrylic sheet was too cumbersome, making it difficult to make minor changes to the stuff underneath. In the end I sorted out my Prusa so that it could use the whole bed and printed the panels - I used the Prusa because I wanted to use up some 3mm black PLA before converting that machine to 1.75mm. The preliminary printed loops that were laid down before the actual part was started actually printed at the very edge of the heated bed, and over the glass clips! smiling smiley

It's now much easier to get into the lower area...
Re: G&C Printer
February 29, 2016 04:41PM
The cnc is pretty messy, is definitely not something you want in the house... smiling smiley
I have used to cnc only to cut some 2 e 3 mm acrylic, wood and mdf, and it works great. In the future i will try with aluminium, but i still not sure if the machine was enough power for the job...

About the center panel you are correct, one big 40cm x 40cm in not easy to remove in case you need to access to board.
In my case i do not see this to be an problem, after i configured everything like i want i never have the need to get access to the board.
Re: G&C Printer
February 29, 2016 04:49PM
The main reason I have for getting into that area is to get at the Duet's SD card - I don't have to do it very often, but sometimes there's no alternative. It was very difficult previously, but now I just loosen 3 screws and I'm in.

I'm also having problems with a noisy cooling fan in there, so I'll need to open up and get that replaced soon. sad smiley
Re: G&C Printer
March 05, 2016 05:04PM
Finished to cut and install all acrylic panels, made a little video to show the final result.


Edited 1 time(s). Last edit at 03/05/2016 05:13PM by filipeCampos.
Re: G&C Printer
March 06, 2016 04:35AM
Very neat! smiling smiley
Re: G&C Printer
March 06, 2016 04:35PM
Nice enclosure!
Re: G&C Printer
March 08, 2016 11:25AM
I really like this design, so much that I am going to make my own copy of the G&C printer spinning smiley sticking its tongue out

All parts are ordered and my Prusa is already working overtime the print all the plastic pieces. I expect the first shipment to arrive tomorrow, but most of the stuff is ordered in China and this will take much longer to arrive.

This is what I've got so far...

I will follow Filipe's design as much as possible but I will make modifications where necessary.

The specs will be;

- Original size according to Filipe's design
- Enclosed at 5 sides, the top will stay open
- MKS SBase 32bit contoller (Smoothieboard ripoff!)
- 3.2" color touchscreen
- Single Bowden hotend, maybe a second one in the future
- 200 x 200mm Mk3 heated bed, with a glass build surface
- IGUS bearings for the X and Y axis.

Edited 1 time(s). Last edit at 03/08/2016 11:28AM by Nosmo.
Re: G&C Printer
March 08, 2016 02:48PM
I will fallow your build and hope you do not fallow too much my design and come with some new ideas i can use too smiling smiley

About the enclosure, i have used 7 panels. I have one panel at the bottom of the printer to protected the electronics and is not visible in the photos or video. I have uploaded all panels on the page on the printer (thingiverse), but i pretty sure you can not directly use the design of these panels because of the M4 holes. You need to change the positions of this M4 holes to adapt to your printer and change the cut of the radds lcd to the 3.2''.

My first extruder setup was an mk8 bowden. I never solved complety to retractions problems, i hope you have better Luke.

Igus bearings are great but all made of plastic.. you need to be careful and not screw too much the printed pieces.

By the way, what prusa is one the photo? can you upload a complete photo of the printer?
Re: G&C Printer
March 08, 2016 03:23PM
My Prusa started it's life as a cheap plastic Chinese i3 kit. Since then almost everything is modified and upgraded the only original parts are the electronics and the stepper motors.

The frame is a Prusa steel frame from Spain, the aluminium X axis is a Chinese kit from AliExpress and is totally modified to make it fit.

I will take some pictures tomorrow during daylight.
Re: G&C Printer
March 09, 2016 07:41AM

By the way, what prusa is one the photo? can you upload a complete photo of the printer?

The piece of cardboard at the back is an experiment to reduce draft from the power supply fan. I used to have lifting issues at only the right side of the print bed, the back was always worse than the front. After this cardboard deflector the lifting issues have disappeared.
My plan was to make some kind of enclosure for this printer to eliminate all draft issues and to change the extruder for a bowden setup, but that is not going to happen anytime soon now that I'm going to build a coreXY.

This is the printer when everything was still original;

Anyway, lets not pollute your topic with Prusa pics.winking smiley

Edited 1 time(s). Last edit at 03/09/2016 07:48AM by Nosmo.
Re: G&C Printer
March 09, 2016 08:01AM
My first printer was an prusa steel, buyed the kit online from spain (createc3d).
The printer was nice overall, but the print quality far to be the best and very noisy. Builded the next enclosure:[www.thingiverse.com]
The enclosure helped to reduse the noise, but was very big and almost impossible to move.
Re: G&C Printer
March 10, 2016 03:32PM
Filipe, just a quick question;

In the BOM is a 608zz bearing listed. I can't find any place in the 123dx file where to put this bearing.
Am I right to assume that this bearing is a support for the Z-spindle, but that the bracket is missing from the 123dx file?

Edited 1 time(s). Last edit at 03/10/2016 03:34PM by Nosmo.
Re: G&C Printer
March 10, 2016 03:48PM
Yes, it was for the z spindle. In the first version the z motor was on the top, them i moved to the bottom. I actually using this spindle on my printer only because i already have printed before and helps a little to center the z screw, but is not something is necessary.

At this point i can update the bom file and remove the bearing or upload a new version of the project with the spindle. What option you prefer?
Re: G&C Printer
March 10, 2016 05:43PM
Does the bearing on top make any difference in your opinion? If yes then I would like to use the bracket and the bearing.

If it doesn't make much difference then I will try it without.
Re: G&C Printer
March 11, 2016 04:54AM
not having it installed will not affect the print quality, but it help the z thread rod to rotate a little more perfectly when the bed is on the bottom of the printer and reduce the vibrations when the bed move fast.
I have installed on my printer because to me is better to have it, i think David is not using this spindle on is printer.

I have added again the spindle to the 123dx project and moved the back 2020 bar more to the top to support it.
Re: G&C Printer
March 11, 2016 05:05AM
I don't have the bearing at the top of my threaded rod, and it works OK without it. Everything is working well at the moment, so I'm not in a hurry to change anything, in case I spoil it! smiling smiley
Re: G&C Printer
March 12, 2016 05:38PM
Making some slow progress, all plastic parts are printed and ready for assembly but most other parts are on the slow boat from China so I'm kind of dead in the water here.

Anyway, I managed to do some assembly;

More jigsaw pieces;

And the steppermotors from reprapworld have arrived (4 in total).

Re: G&C Printer
March 17, 2016 04:10PM
A small package from motedis.com arrived today;

A few hours later;

Re: G&C Printer
March 17, 2016 06:36PM
Is going well...

Motedis is a great chop, good quality aluminium and cuts are very precise.
Re: G&C Printer
March 18, 2016 12:06PM
Check that Motedis have sent you every single thing you ordered... they left a couple of little things out of my order. They did sort it out very quickly though, with no complaint.
Re: G&C Printer
March 18, 2016 01:56PM
No complaints so far, the shipment was 100% complete.

Also the cuts are very precise, just as Felipe already mentioned. My initial idea was to cut the profiles myself but I couldn't have done a better job myself.

Parts are starting to arrive, but not in any predictable or logical order so progress is still very slow.
Re: G&C Printer
March 18, 2016 07:29PM

Re: G&C Printer
March 20, 2016 01:44PM
Change of plan!

I've build the X and Y axis but I'm not happy with the stability, there is too much flex in the Igus bearings. If I tighten the screws more the flex gets less but the bearings don't glide smoothly over the rods anymore. And even with all screws tight there is still too much flex. I suppose that Igus bearings need a metal housing to work properly and the printed plastic bearing housings need steel bearings to get rigid enough to do the job.

So for now I will replace the Y axis bearings for LM8UU's and leave the Igus bearings in the X axis carriage.
Re: G&C Printer
March 21, 2016 04:32AM
I also replaced my igus bearings, for exactly the same reason. sad smiley

I am considering whether to replace the LM8UUs with sintered bronze bearings, held in a plastic casing that has the same external dimensions as the LM8UU. Something like:
This, or
Re: G&C Printer
March 21, 2016 05:53AM

The igus bearing are not easy to install because the casing is all plastic, in my printer i managed to install on both X and Y axis. On the Y axis i have zero play and in the carriage there is less of 1mm of play but is necessary to apply an good amount of force. I pretty sure there are not good for a CNC or something like this, but for 3d printing they do the job fine.
The main problem on installing these igus is to find the correct force apply on the screws, too much and the bearing will not move, less and you get flex. I have uploaded a video where i show the movements of both axis of my printer.
From the video you can see the movement on both axis is not smooth at all, but enough fluid to the motor move the carriage correctly. The height of the carriage is enough to move on the Y axis in case i lean the printer, but not in the X axis.
I think your problem is trying to get the same fluid movement you have with LM8UU, you need to tighten more the screws. The important is to the motor have enought power to move the carriage without losing steeps. My steppers are configured with [0.8, 0.9] volts.

The bronze bearings David suggest appears to be an excellent idea, for what i read there are silent and rigid. If someone try this solution, please tell the result. If there are good i think is the best to replace the info of the igus with this bronze one.

Re: G&C Printer
March 21, 2016 06:20AM
It's a shame that the igus bearings don't have a hard shell, like the rubber bushes fitted to cars (someone will probably tell me that they do make bearings with hard shells!)
Re: G&C Printer
March 26, 2016 07:13AM
My build is now pretty much complete and I'm in the midst of the painful process of calibration and configuration. My hardware list looks pretty much the same as yours @Nosmo - we're both using the MKS SBASE Smoothieware board I think. Could you please share your config with me?

Edited 2 time(s). Last edit at 03/26/2016 07:15AM by simon_smithson.
Re: G&C Printer
March 26, 2016 09:57AM
My printer is not up and running yet and it seems that you are at least a week or so ahead of me. So far I hardly touched the config file but as soon as I have a working file then I will gladly share it.
Re: G&C Printer
March 26, 2016 11:06AM
In which case, If I do ever manage to get it printing well I'll share my config with you! smileys with beer

Biggest issue I'm currently having is with the extruder. I'm currently using a single direct drive. It seems to go wildly from under to over extruding. Not entirely convinced that having the print spool at the bottom of the machine and a length of PTFE tubing is the best approach for me, so I might shift the filament holder to the top of the machine.
Re: G&C Printer
March 26, 2016 12:00PM
What's the Vref on your extruder stepper? Have you tried tightening/loosening the idler bearing holding your filament against the gear?
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