The first simple on I made sucked. Found that the double sided tape did not hold as rigid as I thought. So was in my case basically useless. Sorry about that. So I made another that fits fairly tightly to the laser head. After sliding it on, I dropped two small drops of very thin superglue that holds it tight. Used the same laser and cable as the previous one.
Bought a cheap laser crosshair from AliExpress and a USB C pigtail from amazon (https://www.amazon.ca/dp/B0CCYVZ52R?ref=ppx_yo2ov_dt_b_product_details&th=1)
Plugs into USB C port on the Falcon's head to get power. Not that happy with the quality of the laser crosshair, lines are too think, so may try a different supplier. Anyone who has bought one and got a really sharp thin crosshair let me know.
I printed in PLA. When I printed on another printer in PLA+ found dimension differences were enough that it was too tight. So results will obviously vary depending on material.
The author marked this model as their own original creation.