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RepRap Samuel - A variation on the Mendel

Posted by silpstream 
Re: RepRap Samuel - A variation on the Mendel
April 29, 2016 11:59AM
Sainsmart as a source you mean? I've never bought from them but their ramps based boards look good. I use both a melzi and a arduino mega with a ramps board running Marlin. Both work well. Bought them off of aliexpress. If you want to upgrade in the future, look for something based of of the mega2560. You can load more into the 256k memory space and it has more io pins to add other things to. If you intend to put the stuff into a case, then the arduino with a ramps board has the most designs on thingiverse for you to download and print.
Re: RepRap Samuel - A variation on the Mendel
April 29, 2016 12:10PM
Ok. Thanks
I will check out aliexpress.
I need a whole kit with motors because I am not upgrading I am building a new printer.
I am tempted to take apart my i3.

Thanks
Teddy_P
Re: RepRap Samuel - A variation on the Mendel
January 06, 2017 08:35AM
Hi sorry to resurrect old thread like this, I have i2 vitamins laying around from failed build, I have most of the i2 printed part but a lot of it is dented (I use spring washer and tighten it too hard I guess). I'm planning to build it to Samuel and want to source the printed part. Does anybody here can tell me how much does it weigh (estimate is okay)?
Re: RepRap Samuel - A variation on the Mendel
January 23, 2017 07:55PM
Quote
aaulia
Hi sorry to resurrect old thread like this, I have i2 vitamins laying around from failed build, I have most of the i2 printed part but a lot of it is dented (I use spring washer and tighten it too hard I guess). I'm planning to build it to Samuel and want to source the printed part. Does anybody here can tell me how much does it weigh (estimate is okay)?

I just printed a Samuel in PLA - I have it assembled so I can't give you an exact weight but I'd say it used about 1/2 of a 1kg roll of 1.75mm eSUM PLA+.
Re: RepRap Samuel - A variation on the Mendel
January 23, 2017 07:59PM
I just built a Samuel as an experiment - I took the vitamins from a "1x2 Wooden" Repstrap I built a few years ago and this seemed like a perfect use.

I have a question - could some explain to me the idea behind the Z endstops for the Samuel - in particular - it seems on the X motor and idler parts there is a small hole next to the "Z bolt cage" which looks like a nice place to insert a M3 screw to give you precise control of the Z min position. But it is an awkward place for the bolt to go so I wasn't sure if that was its purpose. Just looking for advice on how people handled this part of the design.
Re: RepRap Samuel - A variation on the Mendel
January 24, 2017 12:50PM
That's what I did. Here's a pic.


Re: RepRap Samuel - A variation on the Mendel
January 24, 2017 01:15PM
Thank you for the quick reply...

Ok that clears things up - it looks like you left out the bolt for the X linear bearing clamp? Seems like I would need to in order to have clearance to adjust the endstop bolt?

Thanks again for putting this together - it has been fun tinkering with my old parts.
Re: RepRap Samuel - A variation on the Mendel
January 24, 2017 01:26PM
Yup, the positioning wasn't ideal because of the bolt for the clamp. I overlooked that when was designing it.

I actually left out the clamps on both sides. Didn't really need it and I found the belt would rub against it sometimes.
Re: RepRap Samuel - A variation on the Mendel
March 01, 2017 08:57AM
Still loving my samuel XL or "Jackson" as I like to call it. I updated my marlin firmware to the recent 1.7.6 rc8 the other day and it prints even better. As a matter of fact I think it could go much faster but due to the increased size of my machine and the rigidity limits of the rods etc. it shakes too much at high speeds. Even with the added front supports the shaking can effect the extruder. SO, my first idea is of course adjusting the speeds, accel, jerk, etc settings but I'm not a 100% of which setting effects what. My second idea which is a good one no matter what is to mount the machine down to a piece of wood. It conveniently will fit perfectly on a piece of 2ft square sanded plywood (Baltic birch the best at lowes) so I'm good.

My question is, I forget the screw size for the feet. I obviously want to try and screw into the existing foot holes ( I actually never made any feet, just sitting on the brackets). I looked on the wiki but I must be missing it. are they m4? Thanks in advance AND again for your help and the printer
Re: RepRap Samuel - A variation on the Mendel
March 01, 2017 09:11AM
They are indeed m4. Sorry I never labeled it clearly. It's only in the name for the vertex part "M8-M4" in the wiki.

The hole for the nut in each foot might be a bit large for some nuts. I had 2 different batches, the first fit nice, but the second was loose. The hole size in each foot should be slightly under 8mm after print, so measure yours and see if you can measure the nuts you are purchasing to fit best.

Good luck! Let us know how it goes. smiling smiley
Re: RepRap Samuel - A variation on the Mendel
March 01, 2017 11:10AM
thanks! I saw that m4 note and assumed but wanted to check. It went very well I used m4 bolts I had intended to use for feet long ago .7 hardware and nuts. here's a pic of the hardware and the printer bolted down. I put many rubber feet on the bottom of the wood so the bolt heads wouldn't scratch the table and isolation.





Re: RepRap Samuel - A variation on the Mendel
March 04, 2017 09:16PM
Wow! Nice! Did things improve with the wooden base? Also do those front supports get in the way of z-height? Could you share the design and some pics of how the top is mounted? I'll add it to the github repository.

Thanks!
Chris
Re: RepRap Samuel - A variation on the Mendel
March 10, 2017 06:49PM
Oh yeah, the wood made a huge difference in the machines shaking. My my z axis threaded rod leadscrews aren't in bearings at the top so they can move around rather than the guild rods since they're also 8mm. They used to slap about in the empty spot where the top 608 bearings should be, now they barely move. 12mm guide rods would probably change the whole calculation in a great way in terms of rigidity. Now strictly speaking whether the machine shakes and whether that shaking effects the process are seperate so I'm not sure it made as big of a difference in the precision of the printer. Although considering the size and weight of mine its also super awesome to move now!

The front supports were a quick way to add rigidity since the front leg things have holes from the original design still in them. I dropped in some threaded rod and it met the top vertices perfectly. there was even room for the clip attachment part to slip on between the angle brackets and the vertical threaded support rods, I didn't even add the screws to the clip since they cant really move anyway. It does suck to lose the i3 look but printing is what counts. The larger problem than height rigidity is that there's only one threaded rod going the length of the machine front to back wise, and there's more to the "front" area so the back can lean forward on it. In theory I think the idea is supposed to be that the guide rods act as that second rod, but in my case at least I 1) prefer to leave one end of one rod loose to allow any error that would jam or screw with movement to flex out (my 12mm rod bed mounts are rigid) and 2) my experience is that the mounts for smooth rod cant ever really grip well enough to resist slip unless maybe you cut a groove in it.

Since I opted to go with a different extruder design than yours ( i think) z height isn't a problem. I forget why now lol but I wanted a slimmer profile to allow clearance in some direction. when I added the front support rods it was nice to not have to worry.

While I was mucking about I figured I'd add one of those bed leveling sensors since my bed is a funhouse mirror level of warped. it's diamond plate alum from lowes, cut by hand and straighten by eye, with a super thin cheapo glass pane from the window repair section of lowes. needless to say bed leveling has been challenging at times. My best method and in truth works really well was to just set z-min height to touching the bed full on, then in some places the first layer was smashed into the bed, others not. It hasn't been a problem on the smashed against the bed areas but adhesion can suck in other areas. I mean it's still workable even at my larger bed size. I was able to print my wife the makerbot headphone stand they have featured around now. its great but large, mostly in the Y axis for most printers. I did a ton of reasearch and settled on a $10 6-36v 1-10mm capacitive NPN sensor with a 18mm diameter from amazon. My reasonong is, since my bed is aluminum with glass over so inductive done simple was not gonna happen, I didn't want any moving parts (That new BTouch probe is great but too $$$), NPN so the signal would be ground and therefore safe for the ramps setup. I found a prefect sensor mount for my extruder on thingiverse. I hooked my sensor to the unused x max endstop signal pin, and 12v of the power supply. in marlin the options for using the probe, without loosing z-min endstop is there. I also choose bi-linear mesh auto bed leveling with a 4x4 grid, double tap probing and the experimental bi-linear subdivision enabled. it's pretty fun to watch it move around and adjust










my_mount.stl
i3extruder.zip

Edited 2 time(s). Last edit at 03/10/2017 06:57PM by mcmasterp.
Re: RepRap Samuel - A variation on the Mendel
March 29, 2017 10:42AM
I'm in the process of building this and have most of it put together. For the Z axis threaded rod do you guys just put a few nuts in the top and drill for a set screw on the bottom to hold it in place or is there a better way to do this? Also, has anyone experimented with the best bed size? I'm going to reuse a 200x200 platform but it looks like I'm going to have tons of extra space.
Attachments:
open | download - i2Samuel.jpg (121.1 KB)
Re: RepRap Samuel - A variation on the Mendel
March 29, 2017 09:51PM
Hi Ceefus,

To be honest you have me a bit lost when you ask about a threaded rods with nuts and set screws. I'll assume that you are talking about the z-axis threaded rod that turns to move the height of your extruder. In mu case I am using 6mm rods for z-height, from the pics that I see mcmasterp has 8mm rods. We both have different methods of coupling the rod to the stepper motor. In my case, I printed some couplers (you'll also need a short bit of aquarium air tube on the stepper for good grip) which you will find in the repository for this printer. Mcmasterp is using a set of aluminium couplers that are pretty easily available online. In no case did we drill holes for set screws. On the top, we left out the bearing and do not have any nuts either. The initial design with the bearing was too constrained, so removal of the bearing gave way for better prints. Take a look at the pictures on the fist page of this thread, you should be able to clearly see the different couplers that we used.

Hope that helps!

Edited 1 time(s). Last edit at 03/29/2017 09:52PM by silpstream.
Re: RepRap Samuel - A variation on the Mendel
March 30, 2017 05:03AM
Actually i did have to drill a set screw for the z. The bottom trapped nut would work free . I used a small m3 screw, though in other style printers i had to drill a dent into the nut for the set screw to really work. I'll try to post a pic later
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