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Lehaiver

SquareBOT 3D printer

by Lehaiver Sep 28, 2014
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Thing Apps Enabled

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Spasibo. Staraemsya.

Alex, why do you use mk2 board and not mk3 AL ? I dont know what would be better for a first printer.

I'm just waiting a bigger hot bed. MK2 is temporary thing.

WOW ! Looks awesome!

I'm currently designing a cnc mill based on MGN12, but I doubt if about place one or two rails on the X axis, and if so, whether opposed or parallel on the same side of the crossbar. I noted that the CNC must withstand negative pressures when drilling

What's your experience with them? Are strong enough to place only one per axis?

I don't think that MGN12 strong enough for milling CNCs... even two carriages per each rail... may be just for soft material milling.
IMHO MGN series is not a good choice for long-playing milling apps... may be just MGN15.
Look load ratings in suppliers descriptions.

As suppliers claims (http://www.hiwin.de/en/MGN-Products_Test?co_id=21089), max load rate is about 3 kg/m, so 500mm rail could manage 6 Kg of load.
Maybe a heavier HGR15C on single rail could do the job, but it is damn HUGE :D

Thanks Lehaiver, and again, congrats for your work !

Thanks! In milling cncs side loads is very important and they high enough.

Nice Design. I like the use of belts for the Z axis.... It should eliminate Z wobble that plagues most RepRaps.
Have you considered using OpenBeam or V-Slots? It might reduce your BOM......

The OpenBeam is good, but I can't buy it in our region.

This appears to be an elegantly designed printer and I'm looking forward to seeing its development. I like that high-quality linear rails are used. The Afinia and Makergear M2 use these same type of linear rails, I consider them both great machines. I have an Afinia, the print quality is high and it has never let me down.... except for the small print area!

Thank you! In this project, print area would be bigger than Afinia's) ...about 266 x 266 mm, but I've cut it for standard 21 cm heatbed.

I like this design, especially because i have some unused linear rails lying around :)
How much of the work is done?

I found a planetary gearbox for NEMA17 with a 12:1 reduction on YouMagine. This should be enough if the z-axis doesn't hold with standard 5:1 geared NEMA17.

It's useful information! I've planning to use 5:1 ratio gearboxes, but thanks to you, 6 days ago I've ordered and yesterday (!!!) already got the geared Nema 11 with 14:1 gear ratio. I can't rotate its shaft by hand and it looks ideal for my project.
By the way, the project is in the "buying parts" stage and improvement of prototype in the Solidworks before I'll start to print its parts.
I am very pleased with promptness of the omc-stepperonline shop.

Nice..
Dear lehaiver.. congratulation on this new model.
i have a question if i may ask. Your design is similar to mine.. (great minds think alike)
how did u deal with the weight on the x axis.. it tends to crash on the bed just after stepper is disable.
and one more thing, some nema17 motor (hybrid) would not support the weight of the axis.
how did u deal with this devastating and frustrating issue. What is the stage of this printers development.
again.. nice build.

Project is almost finished.

Hi! You absolutely right about x-axis and its weight problems. I planning to use stepper motor on z-axis with gear box or simple stepper with worm gear (like on my extruder for this project). This, possibly, could solve the issue. Anyway, I don't want to use screw shafts.
Another solution: pulling the ROSC pin of drivers A4899 chip to ground - set Z-motor to be active 100% of the time.
Actual progress is on renders. Yesterday, I tried to print parts of extruder, but my deltabot has a accuracy problem and needs to be calibrated. Thank you)