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Mowi Printer

by mowi, published

Mowi Printer by mowi Jan 3, 2014

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License

GNU - GPL
Mowi Printer by mowi is licensed under the GNU - GPL license.

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Summary

The Mowi Printer is a foldable 3d printer, It can print big prints with two materials. Folded flat it is small and easy to take along. Put your files on a sd card and you do not even need a laptop to print.

You can make this printer yourself. The frame is made from lasercut Birch Plywood. All other non standard parts are 3d printed.
All information can be found on http://reprap.org/wiki/Mowi_printer.
Up-to-date files to start making can be found on https://github.com/Mowi/MowiPrinter Video is at http://youtu.be/pdC9KxD-kWQ

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Deciding mostly between builing the Mowi and Foldarap, I prefer the dual direct drive of the Mowie and the larger print area, but I'm somewhat concerned. How stable/rigid is the Mowi compared to some other printers? Does it have any issues shifting while printing?

Hi Jedimaster,
as long as you are not taking it of your table during the print there are no problems, in version 3 i included some hendels that keep it pretty stable but probably not enough for moving during printing. If you do not fold and unfold it often you could also put screws through both bottom plates which makes it really sturdy but could be quite a hassle to insert often. The mowiprinter is still in development but I would love to have some more people thinking about solutions :) Version 3 still has some other issues that i am trying to solve now. Let me know if you want more info!

also curious, steppers often come in 5 packs, will they still fit ok if i have 5 large motors and 1 small? or 6 large?

Hi Jedimaster, You could also use big steppers for the extruder. You will loose a bit of the x-axis movement but at the moment my x can move more than 200mm anyway. You will probably need to change the position of the magnet for the x endstop.
By the way, at the moment I am working on a new arrangment for the extruder head. I am looking into using the dual chimera hotend. This is way cheaper than the two hotends i used before and you can easily swap the nozzles

cool, I'm currently assembling a price list in excel, but that sounds good!

Hi Mowi,

Your machine looks great! Specially I commend your effort to balance mobility with build area.

How much do you think the sum of all the parts cost leaving out the laser cut frame?

Also I have trouble reading the DXF file since all the measures are too large or displayed in inches instead of mm for it to be correct. I am measuring with eDrawings.

Hi mowi,
I found this very intersting but could you post more pictures of detailed assembly?
I managed to somehow understand looking at wiki post and the .stp file but there are some details missing like the LCD sliding contraption.

Best regards!

Sep 4, 2015 - Modified Sep 4, 2015
mowi - in reply to ark

Hi Ark, I am sorry i didn't reply earlier. I had to much holiday stuff going on. Unfortunately I cannot do pictures right now. I'll try to do it as soon as possible. For the lcd sliding thing in the current v3 I just use 2 m3 screws and some nuts. The screws go in the holes in the y front and y cross and the nuts secure them.Some extra nuts make sure the display doesn't go to skew. The screws are long enough so they go into the slits in the displaysides. Good luck!

ark - in reply to mowi

Hi,
Don't worry :) I managed to somehow understand what you did there but there are many strange decisions in the design XD so I'm remixing it my way for my personal use, because i don't understand really well the licence that you use.

By the way, do you think 5mm birch wood is fine? (modifying the holes of course) 5,8mm is impossible to find in Spain, and 6mm is really rare and expensive in comparison with 5mm

Best regards!

mowi - in reply to ark

Hi Ark,
Great that you managed. Yes, I am sure there are a lot of strange decisions, i tried to get a big printing volume while keeping a small transport volume. At the same time i wanted to use mostly standard components and not a lot of parts. It is always difficult to find a nice balance between all the requirements. Sometimes i had to do really strange things so i would have enough clearance with the other parts. At other times i probably just made strange choices. I am sorry that is not always that easy to assemble. I am working on the next generation now and i would love to see your adjustments too. I think the frame can easily be done with 5mm birch plywood. I have a parametric inventor file where you only need to change one parameter. Hopefully I worked neatly and all the rest stays put. I can send it to you if you would like. Just give me your email in a private message. The display sides should be no problem either but you will run into trouble with the extruder. You'll either have to change it or wait for the new one which uses cheaper mk8 hotends and will be easier to change to 5mm. I didn't test it yet though so i am not sure it will work.
About the license, I used the same license as the printers i used for inspiration like prusa i3 etc. I would really appreciate it if you could share your modifications too.

ark - in reply to mowi

Sure :) I was doing it in autocad line by line, so you'll recieve my message soon :)
I'm mostly changing printed parts and frame to fit NEMA17 48mm (more usual in spanish shops) , and I will design a single extruder after i mount all the frame and see if my decisions are right XD

I have made a big redesign. Almost all the parts have changed.
Mowi v3 has a more sturdy Y-frame, the possibility to fixate the Y-frame to the z-frame, a Graphic display,
a smaller power supply, a wooden extruder , and a Z probe for auto bed leveling. The new files can be found on Github https://github.com/Mowi/MowiPrinter
The new Bom can be found on reprap.org http://reprap.org/wiki/Mowi_printer
Pictures will follow later

Hi, could you upload a dxf of the wood parts?

yes, it is uploading now to the github

you are awesome.

There will be some changes coming. It seems a smaller powersupply will do and the extra space gives me a chance to increase the stability and add some kind of locking mechanisme to make sure the two halves always maintain the same position during printing.
Ideas are welcome!

would this work to make it out of aluminium instead of wood

Hi Andrew,
Yes, I think it would. You would need to make some adaptations off course. You'll probably want to use thinner plates and you will not be able to screw into the sides of the plates like I did.

Ok thank you

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