Printrbot Simple – Software setup

January 30th, 2014

This post picks up right after you’ve finished all the steps to building your Printrbot Simple and turn it on and plug it into your computer for the first time.

There is an official guide you should follow – and it is worth reading through. I took some notes along the way and will share those here. There is also a forum post which covers setting things up that is worth reviewing as well.

As my home desktop is Linux (Mint 15 Olivia at the moment) following the official guide was a bit different than documented. They cover Windows and OSX, but the software is supported on Linux too.

First up you’ll want the mono-complete package installed as the RepetierHost software is .net based and the mono package provides support for that on Linux.

Then download the RepetierHost software and run the configureFirst.sh script (it will want to sudo and prompt for the password).

The printer communicates with the computer via a USB serial connection. On my system the USB serial device shows up as /dev/ttyACM0. However, regular users can’t talk to this device – so we can run as root OR we can add our user to the serial group. I found a helpful blog post that explained how to do this – just one line:

$ a=`whoami`; sudo usermod -aG dialout $a

As there is a sudo in the command, expect to be asked for the password unless you’ve very recently run a sudo operation. You’ll either have to log out and back in to enable access, or simply reboot.

Screenshot from 2014-01-28 21:12:28

Now we adjust the printer settings as per above, and we should be in business. At this point I was connected to my printer! Very exciting to have software control of some hardware I put together.

In hindsight, reading the RepetierHost manual on installation probably would have saved me some effort I spent searching around to solve the USB serial problem.

Referring to the official manual on page 9  - “Configure Repetier Printer Settings”

Screenshot from 2014-01-28 21:15:45

We’ve already covered the Connection tab, so now we’re onto the Printer tab as per above.

Screenshot from 2014-01-28 21:17:19

Then the Printer Shape tab.

At this point we’re done with the printer settings and want to configure Slicr which has a tab visible on the main RepetierHost screen. Go there, and click on Configure.

Screenshot from 2014-01-28 21:18:59

The Configure button we want is the top most in the screenshot, the lower button is for configuration of Skeinforge which we won’t be using at all.

This should launch a wizard to which we’ll answer the following questions:

  • Firmware type: RepRap (Marlin/Sprinter/Repetier)
  • Bed size: x:100 y:100
  • Nozzle diameter: 0.4mm
  • Filament diameter: 1.75mm
  • Other layers: 200C
  • Bed temp: 0C

Save the settings (click on the floppy disk).

Again, referring to the official setup guide we want to dive into the Slicr settings and make a few changes

Screenshot from 2014-01-28 21:24:41

Layers and perimeters: Layer height 0.3mm / First layer height: 0.35mm, and make sure the check boxes are as shown.

Screenshot from 2014-01-28 21:25:51

Infill, you can see some changes from the official manual here. I’ve adapted the settings as per this forum post.

Screenshot from 2014-01-28 21:35:07

Skirt and brim – loops to 2 and distance from object tweaked.

Screenshot from 2014-01-28 21:37:08

Now on the Filament tab a few changes as well (mostly based on the forum post).

Each of the tabs on the Slicr settings panel needs to be saved (and named) so we can apply them on the RepetierHost main screen.

At this point I hit a snag. The Z axis was way up near the top of the range and the RepetierHost software manual control wouldn’t allow me to move below the zero setting it was configured to.

Clicking the house button (home) will take the printer to the end stops, but as I haven’t calibrated my Z end stop yet that just means ramming the print head into the bed. I’d rather not do that. I dug around for quite some time to resolve this. The answer turned out to be simply: Install Pronterface and use it.

Once installed, Pronterface also refused to allow me to move below zero on the Z axis, but I was able to issue the G-code command “G92 Z50″ (you enter this in the lower right corner of the interface as pictured below)

Screenshot from 2014-01-28 22:09:14

After the G92 Z50 command had been sent, I could shift the Z axis down. If you need to move it further than that, you can simply repeat sending the G92 Z50 command (as I did). This let me set the Z axis end stop “fairly close” to correct.

Now that the Z axis was (able to go) low enough I was able to switch back to RepetierHost and get things sorted out.

I leveled the bed relative to the hot end using a business card as a guide between the hot end and the printer bed. Added 3M blue tape to the bed. And set the Z stop to allow me to ‘home’ automatically.

IMG_2913

During some of my z axis manipulation.. I got the Y axis end stop cable twisted around around the Z rod. This was bad – I pulled the power to stop the grinding. and was able to unwind things and arrange the cabling to avoid the problem again.

I also noticed some of the wires coming from the control board were jamming the Z axis up / down movement. I bent those wires back out of the way. You’ll want to make sure nothing is in the way.

With the hot end all the way forward, you can see that there is some ‘give’ (at least in my build) to allow the hot end to move a bit up and down. Hopefully this won’t cause problems.

At this point I’m really close to being able to print, but there was one more stumbling block. The filament wasn’t feeding.

It doesn’t seem like the filament is making it down into the hot end far enough. When I pull it out.. it’s not soft at all, but you can feel that the hot end is very hot. By judging how far down the filament goes into the hot end it is apparent it’s not making it all the way down. I even removed the hot end and checked that the filament would insert into it properly.

IMG_2915

The trick was to whittle the end of the filament down a little bit to make it a point. Then I could manage to thread the filament all the way down to the bottom of the extruder (hot end).

Now I’m printing!

Printrbot Simple – part 4 – build complete

December 20th, 2013

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Last time I almost finished the build, but got hung up waiting for some glue to dry. There isn’t much more to put together.

The last few steps went very smoothly, I didn’t have much to do and I only had a couple of notes that I’ll add to the bottom of this post.

The part count was pretty good. I was missing 2 – M3 16mm bolts, non critical as the fan took 4 and I just used 2. I had some extra parts: 1 – M3 20mm bolts, 3 – M3 hex nuts, 1 – M3 locking hex nut and 2 spare zip ties (having ‘wasted’ about 5 during the build).

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In terms of tools here is my list: phillips screwdriver, tongue-and-groove pliers, utility knife, krazy glue, epoxy, metric allen key set (2.5 mm, 1.5mm), imperial allen key set (1/16″), loctite threadlocker blue 242, 2 pairs of needle nose pliers, wire cutters, tape measure.

Having access to a computer near the build is also very valuable for reading the directions / looking stuff up.

Read on for details about the last few steps.

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Printrbot Simple – part 3 – more building

December 19th, 2013

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This is the second day of the my build. I originally anticipated finishing the build but hit a few snags right near the end so I stopped before completing it. I didn’t want to rush so as to avoid mistakes, and I was having a blast putting the kit together.

The laser-cut 1/4″ plywood has a wonderful burnt wood smell. The precision of the parts is awesome, things fit perfectly together. I can see why some folks really get into rapid prototyping with laser cut parts, but buying/building a laser cutter is further down my list.

I took a lot fewer notes this round. Again, I reference the steps from the instructions for the Printrbot Simple with Large Motors.

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