My local makers group (Hobart Makers) has a K40 that we are about to perform some long overdue maintenance on - plus a few upgrades.
It runs a Protoneer Rpi-CNC on a Raspberry Pi 3B+ running Laserweb3. An upgrade to laserweb4 was planned 12 months ago but there were unresolved issues with it working correctly via browser interface (since fixed I believe)
To get the Protoneer board to work with the opto end switched, a circuit was designed to add some buffering/inverters. This works well but was done using a perfboard as a ‘temporary’ measure - 4 years ago!. A proper PCB has been designed to interface the flat cable to the Rpi-CNC board, power supply etc. The temporary fix ended up with the ribbon cable being soldered and it needs replacing. No one seems to have a source for this cable but I have found an Aliexpress store that will make a few to the correct length.
My question (finally!) is “How long is this cable?”
Other upgrades will be to add interlocks, a 24V power supply with 5V for the Pi, relocating the mains power switch to the side of the cabinet and inprovements to water cooling and air asist. Both of these last two items are working but are noisy!