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I think it, i tinker it, i make it :-)


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Playmobil GOPRO action camera

An action camera designed for Playmobil play sets, a helmet support is provided.

The attach between the support and the camera is acted via magnets.

Printing advices

Print as low as possible temperature, print the camera and the attach far as possible each other in the printing bed, in order to cool down.

How i Designed this

I designed the objects with FreeCAD

FreeCAD source is available for edit / remix.


2018/11/06 00:30 · alessio.cavalieri

Ubuntu 18.04 LTS ( Bionic Beaver ) - notes on setup

Useful applications and programs

Some applications that i have installed, with the respective package to install

For install from terminal (CLI): use the command

$ sudo apt-get install packet_name


program/application name (explanation) packet_name info url


Emacs (text editor) emacs Wikipedia


gThumb (gThumb is a free and open-source image viewer and organizer, useful for printing photos) gthumb Wikipedia


nmap (security / ip port network scanner) nmap Wikipedia

but is also possible install the programs via the Ubuntu Software Center by clicking the icon on the launcher

Ubuntu Software Center icon

Auto Start Up an Application

  1. Click the Dash Home icon (or tap Super), type 'Startup Applications' to search for the application and run it.
  2. Click the “Add” button.
  3. Name a program.
  4. Click the “Browse” button and navigate to “Computer” > usr > bin, where programs are usually installed.
  5. Select a program, click the “Open” button followed by the “Add” button.


SSH and X

To enable X forwarding as default when connected via SSH on other host, in the file


made this modifications

ForwardAgent yes
ForwardX11 yes
ForwardX11Trusted yes

Emacs and corrupted font

Emacs display squares instead of characters when remoted connected (Emacs launched via X). Create the file file ~/.Xdefaults containing

emacs*font: 7x14

and execute

xrdb -merge ~/.Xdefaults

this is at once setup, for make it permanent, create a file called i.e. with this content:

xrdb -merge ~/.Xdefaults

and save it in the directory


Source for some info:

2018/06/24 00:14 · alessio.cavalieri

Meltdown and Spectre pencils holders

This is a set of two pencils holders themed, based on the logos of Meltdown and Spectre vulnerabilities.

Printing advices

I have printed all the two pencils holders scaled at 50%, some differences for infilling and perimeters:

Meltdown: 10% infill 2 perimeters

Spectre: 25% infill, 4 perimeters or above, depending on nozzle diameter. It is not necessary increase the number of perimeters for strengthen the structure but to prevent the print head from being made to bounce too much during printing, increase it up to until the infill disappear from the outer walls of the ghost, the external walls must become made only of perimeters.

How i Designed this

I designed the two pencils holders with FreeCAD, extruding the 2D SVG files from the logos into mesh objects, and subsequently cutted with a 20 degree angle on the top.

My work has made possible thanks to the availability of the 2D logos. The author of the logos Natascha Eibl has published her work on the website and released it under CC0 license, thanks very much for this!!!

FreeCAD source is available for edit / remix.


2018/02/11 00:51 · alessio.cavalieri

Battery cover for Jeep Wrangler Rubicon remote controlled


The battery cover is designed for work as replacement for remote controller transmitter that work with Jeep Wrangler Rubicon toy.

My son has lost it, i have designed and printed this thing for replace the orignal one.

Printing instructions

It's simple to print, no special recommendations.


The FreeCAD design source is available for download on Thingiverse


2017/12/27 17:24 · alessio.cavalieri

Bulldog Lite on FABtotum

Bulldog Lite feeder on the FABtotum personal fabricator

The test is based on this setup:

FABtotum personal fabricator 1.0
FABui v0.93
FABlin 1.0.0091
Hybrid head 1.0 (j-head with 0.35 mm nozzle)

A new bowden tube is attached to the head and original bowden is still attached on original feeder.

I have made this simple adapter in order to use the Bulldog lite with the original cabling without make any modification and restore easily the original feeder.

Steps per unit in the wiring diagram are for Bulldog XL
Do not connect or disconnect the stepper motor to the TOTUMduino with the FABtotum powered on, you can burn the stepper driver SOLDERED on the board

Before start to print is necessary set the steps per unit for E axis with

M92 E96.4585

command and store it into the EPROM with the


command (this operation is valid for FABlin firmware in the FABtotum but also for Marlin firmware on a generic RepRap printer).

The sample print is sliced with Slic3r, without using retraction.

The connector used in adapter was recovered from a broken CD-ROM drive board.



Special thanks to Gianluca Faletti (aka Kino), for hints on steps per unit calculation.

2017/12/26 15:52 · alessio.cavalieri

Recent updates

en/start.txt · Last modified: 2017/12/31 01:09 by alessio.cavalieri