Raspberry Pi brings back memories of the ZX81

Timex Sinclair ZX81 Computer

The Raspberry Pi computer reminds me of the Timex Sinclair ZX81 that let me build my own computer, and will enable today’s learners to step forward towards the next 30 years in turn! both are products seen first in the UK and enjoy many similarities, although the 30 years between also provide some extraordinary steps forward! Continue reading

Signs, Signs – Everywhere 3D Printed Signs

SignNotAWhiteboardIcon

Using a 3D printer, the new $8,400 Smartboard is protected from unknowing misuse by a few cents’ worth of plastic and a few craft supplies. A 3D Printed sign and a few small rare earth magnets are all that is needed to alert students and faculty that the Smartboards should not be used as a Whiteboard, keeping the display surface clean and operational – a great way to show off 3D printing to faculty and school administrators. Continue reading

Making Proprietary Generic, Reusable and Inexpensive

3D Printed Custom Refilling Funnel with Side Ports

Using a 3D printer and a few cents’ worth of plastic, one teacher can now refill proprietary printer cartridges for 1/20th the cost of a new cartridge using generic supplies. It took three tries to bypass all measures designed to prevent refilling by the manufacturer, but this involved only simple changes in a CAD program and a little time for reprints. Continue reading