Quote Originally Posted by m_c View Post
Why?
Modern belts don't stretch.
Belts may be modern but I'm not

If the belt doesn't change it's elongation over time when left in tension that could save me a very inconvenient switch. I was thinking to measure the length of the bed in stepper resolution at start up then scale the G code to match.

This is kind of crucial because I have designed for a 3/4" aluminium tube inside the gantry which carries the head control wiring to the flexi cable conduit that connects to the head.

If the belt needs constant calibration this tube goes full length to get a switch at the far end.

If the belt doesn't need constant calibration the tube only goes half way and the fitting is different.

It will be a pig to fix if I get it wrong.

This is the last part before I can fit the long belt, so what do I do? Full width or half way?