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Panelolu2 by Think3dPrint3d Feb 15, 2013
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The PaneIolu2 is a new version of the original Panelolu that uses an I2C port expander.

More detail at http://blog.think3dprint3d.com/2013/02/panelolu2.html

available here http://www.think3dprint3d.com/Electronics/Panelolu2

The I2C port expander is used to drive the LCD screen and adds a piezo buzzer, and indication LEDs. This uses less pins making it compatible with the Mezli electronics and even leaves enough spare pins to drive a couple more outputs. Versions available for Printrboard, RAMPS, Melzi and Sanguinololu


The case comes in two main parts - front and back. The SCAD file has a switch at the beginning to generate either the front or back, I have added the STLs as well

You will also need knob for the rotary encoder. I have modified MiseryBot's design:
to be about 1/3 smaller, and cut it a lot thinner. The STL for this is uploaded and I will get the SCAD code up once its integrated into the rest of the Panelolu2 code.

The SCAD file also has the option to generate legs to use as a stand, as shown in the attached photo. I have uploaded the leg and front lug (2 required) for a 60 degree from horizontal option which I like – the SCAD code is easy to change to make legs to hold the screen at whatever angle you like (between about 20 and 80 degrees!)

In order to make the Panelolu2 "plug and play" with as many 3d printer control electronics as possible adapter boards are used (see the blog post for details). Currently there are boards for Sanguinololu and Melzi, I will be adding designs for RAMPS, Printrboard and others if there is interest. It is also possible to crimp standard connectors onto the ribbon cable which should allow compatibility with any electronics that have the required pins and memory. The eagle files for these boards are available on github:

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Panelolu2 by Think3dPrint3d is licensed under the GNU - GPL license.

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Great design. I now have it working on my Printrboard Rev B.

On your website, you indicated that testing had only occurred on a Rev D, but you should know the Rev B works fine too.

Great work. The casing was difficult to print due to the cheap filament I used, but I am satisfied anyway. http://diycrap.blogspot.no/2013/08/i2c-display-and-rotary-encoder-on-melzi.htmlhttp://diycrap.blogspot.no/201...

Great work man, I shall be doing some ebay shopping shortly! :)


Let me know how you get on :D

Hi All

Finally, after a break to move offices, we have listed the RAMPS and Printrboard adapters on eMakershop and eBay.

Hi All

Printrboard and RAMPS 1.3 adapters now available, sorry for the delay!

details here:


Thanks for the update, I look forward to getting one when!

Great work! Has there been any progress on the Printrboard adaptor? or would it be better to stick to a version 1 Panelolu?

Hi acon. The Printrboard adapter is in the queue for manufacture. We expect them next week. I will put a note up on the blog and here once they are available.

That would be great, thanks!

good stuff, want to use this on my reprappro mendel running a melzi board so will do some reading up and then pop over to emakershop if it pans out

Nice work! I'd be interested in seeing a Printrboard adaptor.

Yeah I am going to work on one later in the week I hope.