The Bagatelle
This 3d printed Bagatelle is a 3/4 scale replica of a Chad Valley Bagatelle that I owned back in the 60's. All parts and lettering (including the spring) were printed in PLA with some special techniques to create the lettering.
Marble Machine Mk II
This is the MKII Marble Machine which has evolved to include a marble bouncer and having been working in association with GlobalFSD, now has 22 different filaments. The ball travels 12 feet on its journey to the lower end on the main run.
There are currently 95 separate parts, which were created using ‘Openscad’ and ‘Slic3r’.
The printed spring proved to be very successful. The first attempt at a spring, produced one that was too powerful and had to be modified to half the power, which now provides operation characteristics very similar to the original. The spring was based on an ’Openscad’ design by ‘Juan Gonzalez-Gomez’ (Obijuan).
The wheel has some slotted holes which allow the ball to take an alternative route through to the derelict end where the ball falls off a broken track and bounces back to the start. The wheel is driven by an N20 geared motor.
The gear teeth were based on an Openscad design created by ‘Greg Frost’ (thingiverse.com/thing:3575)
The Buzz Machine
Contact is detected by an Adruino Lilypad input pin, with a 680k ohm pullup. Alternatively, a darlington pair of transistors could be used. A piezo sounder is used to make the audible sound.
The Buzz skill machine uses Proto Pasta conductive PLA for the trace, handle hook and connecting lead. All three conductive parts were made from a 10 metre sample from GlobalFSD. This is achieved by using a small percentage infill. Even with light infill, the trace only has a resistance end to end of around 8000 ohms. The other parts are printed from wood colour PLA.
‘Openscad’ and ‘Slic3r’ were used to design the parts. The designs can be found at 3dsha.re (search for buzz’)